{"id":6423,"date":"2024-09-11T09:24:10","date_gmt":"2024-09-11T09:24:10","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=6423"},"modified":"2026-08-17T15:50:02","modified_gmt":"2026-08-17T15:50:02","slug":"css-color-change","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/css-color-change\/","title":{"rendered":"HTML\u3068CSS\u3067\u6587\u5b57\u8272\u3092\u5909\u3048\u308b\u65b9\u6cd5\uff5c\u521d\u5fc3\u8005\u5411\u3051\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"\n<!-- withmedia-ketsuron -->\n<!-- snip:colorchange-ketsuron -->\n<h2 class=\"wp-block-heading\">\u3053\u306e\u8a18\u4e8b\u306e\u7d50\u8ad6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>HTML\u3067\u6587\u5b57\u8272\u3092\u5909\u3048\u308b\u306b\u306f\u3001CSS\u306ecolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3046\u306e\u304c\u6b63\u89e3\u3067\u3059\u3002<\/strong>\u8272\u3092\u5909\u3048\u305f\u3044\u6587\u5b57\u3092<code>&lt;span&gt;<\/code>\u306a\u3069\u3067\u56f2\u307f\u3001<code>color<\/code>\u3067\u8272\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u304b\u3064\u3066\u306e<code>&lt;font color&gt;<\/code>\u30bf\u30b0\u306fHTML5\u3067\u5ec3\u6b62\uff08\u975e\u63a8\u5968\uff09\u306b\u306a\u3063\u305f\u305f\u3081\u3001\u3053\u308c\u304b\u3089\u66f8\u304f\u30b3\u30fc\u30c9\u3067\u306f\u5fc5\u305aCSS\u306ecolor\u3067\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- \u6bb5\u843d\u5168\u4f53\u306e\u8272\u3092\u5909\u3048\u308b\uff08style\u5c5e\u6027\uff09 --&gt;\n&lt;p style=&quot;color: #d16176;&quot;&gt;\u3053\u306e\u6587\u5b57\u306f\u30d4\u30f3\u30af\u8272&lt;\/p&gt;\n\n&lt;!-- \u4e00\u90e8\u306e\u6587\u5b57\u3060\u3051\u8272\u3092\u5909\u3048\u308b --&gt;\n\u3053\u308c\u306f&lt;span style=&quot;color: red;&quot;&gt;\u8d64\u3044\u6587\u5b57&lt;\/span&gt;\u3067\u3059\u3002<\/code><\/pre><\/div>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* CSS\u30d5\u30a1\u30a4\u30eb\u3067\u307e\u3068\u3081\u3066\u6307\u5b9a\u3059\u308b\u306e\u304c\u63a8\u5968 *\/\n.text { color: #d16176; }<\/code><\/pre><\/div>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.40.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30da\u30f3\u535a\u58eb\uff01\u30c6\u30ad\u30b9\u30c8\u306e\u8272\u3092\u5909\u3048\u305f\u3044\u306e\u3067\u3059\u304c\u3001\u3088\u304f\u308f\u304b\u308a\u307e\u305b\u3093\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.08.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u4efb\u305b\u308b\u306e\u3058\u3083\u3002\u4eca\u56de\u306f\u3001HTML\u30bf\u30b0\u3084CSS\u3092\u4f7f\u3063\u3066\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3059\u308b\u304b\u3089\u3088\u30fc\u304f\u805e\u304f\u3093\u3058\u3083\u305e\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u306f\u3044\uff01\u304a\u9858\u3044\u3057\u307e\u3059\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p class=\"wp-block-paragraph\">Web\u5236\u4f5c\u3092\u5b66\u3073\u59cb\u3081\u308b\u3068\u3001HTML\u3084CSS\u3092\u4f7f\u3063\u305f\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u3067\u6700\u521d\u306b\u58c1\u306b\u3076\u3064\u304b\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u7279\u306b\u3001\u6587\u5b57\u306e\u8272\u3092\u81ea\u7531\u306b\u5909\u3048\u308b\u65b9\u6cd5\u306f\u57fa\u672c\u7684\u306a\u30b9\u30ad\u30eb\u3067\u3042\u308a\u306a\u304c\u3089\u3001\u6b63\u78ba\u306b\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u96e3\u3057\u3044\u3068\u611f\u3058\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u8a18\u4e8b\u3067\u306f\u3001HTML\u30bf\u30b0\u3084CSS\u3092\u4f7f\u3063\u3066\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u5177\u4f53\u7684\u306a\u65b9\u6cd5\u3092\u3001\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_announce wp-block-paragraph\">\u300c\u5b66\u7fd2\u2192\u6848\u4ef6\u7372\u5f97\u300d\u306b\u3064\u306a\u3052\u305f\u53d7\u8b1b\u751f\u306e\u30ea\u30a2\u30eb\u306a\u4f53\u9a13\u8ac7\u3082\u516c\u958b\u4e2d\uff01<br>\u50cd\u304d\u65b9\u3092\u5909\u3048\u305f\u3044\u65b9\u306b\u3082\u97ff\u304f\u30b9\u30c8\u30fc\u30ea\u30fc\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_info wp-block-paragraph\"><strong><strong>\u83c5\u4e95<\/strong>\u3055\u3093<\/strong><br>\u5c06\u6765\u7684\u3078\u306e\u4e0d\u5b89\u3068\u5b50\u80b2\u3066\u3068\u3044\u3046\u80cc\u666f\u304b\u3089\u300c\u526f\u696d\u300d\u306b\u6311\u6226\u3057\u3088\u3046\u3068\u6c7a\u610f\u3002\u72ec\u5b66\u304b\u3089\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u5b66\u7fd2\u3092\u958b\u59cb\u3057\u3066\u3044\u305f\u304c\u3001WithCode\u306b\u51fa\u4f1a\u3044\u4f53\u9a13\u30b3\u30fc\u30b9\u3092\u53d7\u8b1b\u3002\u7d044\u30f6\u6708\u306e\u5b66\u7fd2\u306b\u53d6\u308a\u7d44\u307f\u3001\u5f53\u521d\u306e\u76ee\u6a19\u3067\u3042\u3063\u305f\u5352\u696d\u30c6\u30b9\u30c8\u5408\u683c\u3092\u5b9f\u73fe\u3057\u305f\u3002WithCode Platinum\u306b\u30663\u4ef6\u306e\u6848\u4ef6\u3092\u62c5\u5f53\u3057\u3001\u73fe\u5728\u306f\u526f\u696d\u3060\u3051\u3067\u306a\u304f\u672c\u683c\u7684\u306b\u300c\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u300d\u3068\u3057\u3066\u5728\u5b85\u3067\u6d3b\u8e8d\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u8003\u3048\u308b\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8a73\u3057\u304f\u306f<a href=\"https:\/\/withcode.tech\/media\/interview-5\/\" title=\"\">\u3053\u3061\u3089\u306e\u8a18\u4e8b<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/02\/\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc-6-1-300x169.png\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/withcode.tech\/media\/interview-5\/\">\u3010\u5b50\u80b2\u3066\u30de\u30de\u3055\u3093\u5fc5\u898b\u3011\u300c\u5728\u5b85\u00d7\u526f\u696d\u300d\u3092\u9054\u6210\uff01\u591a\u65b9\u5411\u3067\u6d3b\u8e8d\u4e2d\u306e\u30de\u30de\u3055\u3093\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u306b\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\uff01<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">\u30da\u30f3\u535a\u58eb\u3001\u30de\u30de\u3055\u3093\u306a\u306e\u306b\u5728\u5b85\u3067\u526f\u696d\u3082\u3053\u306a\u3057\u3066\u3044\u308b\u65b9\u304c\u3044\u308b\u3063\u3066\u805e\u3044\u305f\u3093\u3067\u3059\u3051\u3069\u3001\u672c\u5f53\u3067\u3059\u304b\uff1f\u3060\u3068\u3057\u305f\u3089\u3059\u3054\u3059\u304e\u307e\u3059\uff01 \u3046\u3080\u3001\u3046\u3061\u306e\u53d7\u8b1b\u751f\u3067\u306a\u3001\u307e\u3055\u306b\u201c\u6642\u9593\u3082\u5834\u6240&#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\n<p class=\"is-style-balloon_box2 wp-block-paragraph\"><strong><strong>\u83c5\u4e95<\/strong>\u3055\u3093\u306e\u4e3b\u306a\u5236\u4f5c\u5b9f\u7e3e\u306f\u3053\u3061\u3089<\/strong><\/p>\n\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -external\" data-type=\"type3\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u5e83\u544a\u7528\u9014\u3067\u306e\u65b0\u898fLP\u5236\u4f5c<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/07\/\u83c5\u4e95\u3055\u3093.webp\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/withcode.tech\/works\/yourdelt\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u682a\u5f0f\u4f1a\u793eYOURDELT \u69d8<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>HTML\u306ecolor\u30bf\u30b0\u3067\u6587\u5b57\u8272\u3092\u6307\u5b9a\u3059\u308b3\u3064\u306e\u65b9\u6cd5<\/strong><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1232\" height=\"900\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-09-11-18.14.01.jpg\" alt=\"HTML\u306ecolor\u30bf\u30b0\u3067\u6587\u5b57\u8272\u3092\u6307\u5b9a\u3059\u308b3\u3064\u306e\u65b9\u6cd5\" class=\"wp-image-6529\" style=\"object-fit:cover\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-09-11-18.14.01.jpg 1232w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-09-11-18.14.01-768x561.jpg 768w\" sizes=\"(max-width: 1232px) 100vw, 1232px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>font\u30bf\u30b0\u3092\u4f7f\u3046<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3067\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u969b\u306b\u3001\u53e4\u304f\u304b\u3089\u4f7f\u308f\u308c\u3066\u3044\u305f\u65b9\u6cd5\u306e\u4e00\u3064\u306b&lt;font&gt;\u30bf\u30b0\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30bf\u30b0\u306f\u3001HTML\u306e\u521d\u671f\u304b\u3089\u5229\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u7c21\u5358\u306b\u6587\u5b57\u306e\u8272\u3084\u30d5\u30a9\u30f3\u30c8\u30b9\u30bf\u30a4\u30eb\u3092\u5909\u66f4\u3067\u304d\u308b\u305f\u3081\u3001\u521d\u5fc3\u8005\u306b\u3068\u3063\u3066\u306f\u5206\u304b\u308a\u3084\u3059\u3044\u624b\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3068\u3048\u3070\u3001&lt;font&gt;\u30bf\u30b0\u3092\u4f7f\u3063\u3066\u8d64\u8272\u306e\u6587\u5b57\u3092\u8868\u793a\u3057\u305f\u3044\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;font color=&quot;red&quot;&gt;\u3053\u306e\u6587\u5b57\u306f\u8d64\u8272\u3067\u3059&lt;\/font&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">&lt;font&gt;\u30bf\u30b0\u306ecolor\u5c5e\u6027\u3092\u4f7f\u3063\u3066\u3001\u8272\u3092\u6307\u5b9a\u3067\u304d\u3001\u6307\u5b9a\u3057\u305f\u3044\u8272\u3092\u82f1\u8a9e\u306e\u8272\u540d\u308416\u9032\u6570\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\uff08\u4f8b\uff1a#ff0000\uff09\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u6587\u5b57\u306e\u8272\u3092\u7c21\u5358\u306b\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3068\u3057\u3066\u3001\u6b21\u306e\u30b3\u30fc\u30c9\u306f\u9752\u8272\u306e\u6587\u5b57\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;font color=&quot;#0000ff&quot;&gt;\u3053\u306e\u6587\u5b57\u306f\u9752\u8272\u3067\u3059&lt;\/font&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u6b21\u306e\u3088\u3046\u306bRGB\u5024\u3092\u4f7f\u7528\u3057\u3066\u8272\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;font color=&quot;rgb(255,0,0)&quot;&gt;\u3053\u306e\u30c6\u30ad\u30b9\u30c8\u306f\u8d64\u8272\u3067\u3059&lt;\/font&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">RGB\u306e\u5404\u5024\uff08\u8d64\u3001\u7dd1\u3001\u9752\uff09\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u5fae\u8abf\u6574\u3092\u884c\u3044\u3001\u3088\u308a\u8a73\u7d30\u306a\u8272\u306e\u6307\u5b9a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>HTML\u3067\u6587\u5b57\u8272\u6307\u5b9a\u6642\u306e\u6ce8\u610f\u70b9\u3068\u975e\u63a8\u5968\u30bf\u30b0<\/strong><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"918\" height=\"624\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-24-8.41.01.png\" alt=\"HTML\u3067\u6587\u5b57\u8272\u6307\u5b9a\u6642\u306e\u6ce8\u610f\u70b9\u3068\u975e\u63a8\u5968\u30bf\u30b0\" class=\"wp-image-7778\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-24-8.41.01.png 918w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-24-8.41.01-768x522.png 768w\" sizes=\"(max-width: 918px) 100vw, 918px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>\u975e\u63a8\u5968\uff01\uff1f font\u30bf\u30b0\u306b\u3064\u3044\u3066<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">&lt;font&gt;\u30bf\u30b0\u306f\u3001HTML\u306e\u521d\u671f\u304b\u3089\u6587\u5b57\u306e\u8272\u3084\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u73fe\u5728\u3067\u306f\u975e\u63a8\u5968\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\uff08<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTML\/Element\/font\">HTML\u516c\u5f0f\u30da\u30fc\u30b8&lt;font&gt;<\/a>\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span class=\"swl-marker mark_yellow\"><strong>HTML5\u306e\u4ed5\u69d8\u306b\u304a\u3044\u3066\u3001\u3053\u306e\u30bf\u30b0\u306f\u4f7f\u308f\u306a\u3044\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u304a\u308a\u3001\u4ee3\u308f\u308a\u306bCSS\u3092\u7528\u3044\u305f\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u304c\u4e00\u822c\u7684<\/strong><\/span>\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001&lt;font&gt;\u30bf\u30b0\u306f\u30c7\u30b6\u30a4\u30f3\u3068\u69cb\u9020\u304c\u6df7\u5728\u3059\u308b\u305f\u3081\u3001HTML\u306e\u76ee\u7684\u3067\u3042\u308b\u300c\u69cb\u9020\u3092\u8a18\u8ff0\u3059\u308b\u8a00\u8a9e\u300d\u3068\u3057\u3066\u306e\u5f79\u5272\u304b\u3089\u9038\u8131\u3057\u3066\u3057\u307e\u3046\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-big_icon_batsu wp-block-paragraph\"><strong>&lt;font>\u30bf\u30b0\u3092\u4f7f\u3046\u554f\u984c\u70b9<\/strong><br>\u30fb<strong>HTML5\u4ee5\u964d\u3067\u306f\u975e\u63a8\u5968<\/strong><br>\u30b3\u30fc\u30c9\u304c\u8aad\u307f\u306b\u304f\u304f\u306a\u308a\u3001\u4fdd\u5b88\u6027\u304c\u4f4e\u4e0b\u3059\u308b\u3002<br><br>\u30fb<strong>\u4fdd\u5b88\u304c\u5927\u5909<\/strong><br>\u8907\u6570\u30da\u30fc\u30b8\u3084\u8907\u6570\u8981\u7d20\u306b\u540c\u3058\u8272\u3092\u9069\u7528\u3059\u308b\u5834\u5408\u3001\u3059\u3079\u3066\u306e\u7b87\u6240\u306b &lt;font> \u30bf\u30b0\u3092\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u975e\u52b9\u7387\u3002<br><br>\u30fb<strong>\u30c7\u30b6\u30a4\u30f3\u306e\u4e00\u8cab\u6027\u304c\u5d29\u308c\u308b<\/strong><br>\u66f4\u65b0\u4f5c\u696d\u306e\u969b\u306b\u30df\u30b9\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u3001\u7d71\u4e00\u611f\u3092\u4fdd\u3061\u306b\u304f\u3044\u3002<br><br>\u30fb<strong>\u4e92\u63db\u6027\u306e\u554f\u984c<\/strong><br>\u6700\u65b0\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u8868\u793a\u3055\u308c\u3066\u3082\u3001\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3084\u7279\u5b9a\u74b0\u5883\u3067\u306f\u5d29\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u7406\u7531\u304b\u3089\u3001\u73fe\u5728\u3067\u306f&lt;font>\u30bf\u30b0\u3067\u306f\u306a\u304f\u3001CSS\u3092\u4f7f\u3063\u3066\u30b9\u30bf\u30a4\u30eb\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u3092\u4f7f\u3048\u3070\u3001\u30b9\u30bf\u30a4\u30eb\u3092\u4e00\u5143\u7ba1\u7406\u3067\u304d\u3001\u3088\u308a\u67d4\u8edf\u3067\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u3001\u5916\u90e8\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3092\u4f7f\u3048\u3070\u3001\u8907\u6570\u306e\u30da\u30fc\u30b8\u3084\u8981\u7d20\u306b\u540c\u3058\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u3001\u66f4\u65b0\u3082\u7c21\u5358\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.09.27.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>&lt;font>\u30bf\u30b0\u306f\u904e\u53bb\u306b\u4fbf\u5229\u3060\u3063\u305f\u3082\u306e\u306e\u3001\u73fe\u5728\u306f\u305d\u306e\u4f7f\u7528\u3092\u907f\u3051\u3001CSS\u3067\u306e\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u308b\u306e\u3058\u3083\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30c7\u30b6\u30a4\u30f3\u9762<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3067\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u969b\u3001\u30c7\u30b6\u30a4\u30f3\u9762\u3067\u8003\u616e\u3059\u3079\u304d\u3044\u304f\u3064\u304b\u306e\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<span class=\"swl-marker mark_yellow\"><strong>\u6587\u5b57\u8272\u306e\u9078\u5b9a\u306f\u3001\u5358\u306b\u8996\u899a\u7684\u306a\u8981\u7d20\u3060\u3051\u3067\u306a\u304f\u3001\u5168\u4f53\u306e\u30c7\u30b6\u30a4\u30f3\u30d0\u30e9\u30f3\u30b9\u3084\u30e6\u30fc\u30b6\u30fc\u306e\u8aad\u307f\u3084\u3059\u3055\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b<\/strong><\/span>\u305f\u3081\u3001\u614e\u91cd\u306b\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u306e\u78ba\u4fdd<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u80cc\u666f\u8272\u3068\u6587\u5b57\u8272\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306f<strong><span class=\"swl-marker mark_yellow\"> 4.5:1\u4ee5\u4e0a <\/span><\/strong>\u304c\u63a8\u5968\u3002<br>\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u4e0d\u8db3\u3060\u3068\u6587\u5b57\u304c\u8aad\u307f\u3065\u3089\u304f\u306a\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u304c\u4f4e\u4e0b\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br>\u4f8b\u3048\u3070\u3001\u767d\u80cc\u666f \u00d7 \u8584\u3044\u9ec4\u8272\u3084\u6de1\u3044\u30b0\u30ec\u30fc\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u8aad\u307f\u306b\u304f\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304c\u8fd1\u3044\u5177\u4f53\u4f8b<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u80cc\u666f: <code>#767676<\/code>\uff08\u7070\u8272\uff09 \u00d7 \u6587\u5b57: <code>#FFFFFF<\/code>\uff08\u767d\uff09<\/li>\n\n\n\n<li>\u80cc\u666f: <code>#595959<\/code>\uff08\u6697\u3044\u7070\u8272\uff09 \u00d7 \u6587\u5b57: <code>#F1F1F1<\/code>\uff08\u8584\u3044\u7070\u8272\uff09<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. \u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u306e\u7d71\u4e00<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u8907\u6570\u306e\u8272\u3092\u30e9\u30f3\u30c0\u30e0\u306b\u4f7f\u3046\u306e\u306f\u907f\u3051\u307e\u3057\u3087\u3046\u3002\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u30c7\u30b6\u30a4\u30f3\u306b\u4e00\u8cab\u6027\u3092\u6301\u305f\u305b\u308b\u305f\u3081\u306b\u3001\u3042\u3089\u304b\u3058\u3081\u30ab\u30e9\u30fc\u30b9\u30ad\u30fc\u30e0\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<strong><span class=\"swl-marker mark_yellow\">\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u306b\u5408\u308f\u305b\u3066\u30ea\u30f3\u30af\u3084\u91cd\u8981\u306a\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30f3\u30c8\u3092\u3064\u3051\u308b\u3068\u3001\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306a\u5370\u8c61<\/span><\/strong>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3. \u8272\u899a\u7570\u5e38\u3078\u306e\u914d\u616e<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u3001\u8d64\u3068\u7dd1\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u8b58\u5225\u304c\u96e3\u3057\u3044\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002\u8272\u3060\u3051\u306b\u983c\u3089\u305a\u3001<span class=\"swl-marker mark_yellow\"><strong>\u30a2\u30a4\u30b3\u30f3\u3084\u30c6\u30ad\u30b9\u30c8\u3001\u88c5\u98fe<\/strong><\/span>\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8ab0\u306b\u3067\u3082\u5206\u304b\u308a\u3084\u3059\u3044\u30c7\u30b6\u30a4\u30f3\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">4. \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u7570\u306a\u308b\u30c7\u30d0\u30a4\u30b9\u3084\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u3066\u3001\u8272\u306e\u898b\u3048\u65b9\u3082\u5909\u5316\u3057\u307e\u3059\u3002\u30e2\u30d0\u30a4\u30eb\u3067\u306f\u5c0f\u3055\u306a\u6587\u5b57\u304c\u80cc\u666f\u306b\u57cb\u3082\u308c\u3084\u3059\u3044\u305f\u3081\u3001\u8272\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u3084\u6587\u5b57\u30b5\u30a4\u30ba\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30c7\u30b6\u30a4\u30f3\u9762\u306b\u304a\u3044\u3066\u306f\u3001\u5358\u306b\u300c\u898b\u305f\u76ee\u304c\u826f\u3044\u300d\u3060\u3051\u3067\u306f\u306a\u304f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u5feb\u9069\u306b\u95b2\u89a7\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u3092\u91cd\u8996\u3057\u305f\u914d\u8272\u3084\u6587\u5b57\u8272\u306e\u9078\u5b9a\u304c\u91cd\u8981\u3058\u3083\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30d6\u30e9\u30a6\u30b6\u306e\u4e92\u63db\u6027<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3067\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u969b\u306b\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u4e92\u63db\u6027\u3082\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u7279\u306b\u7570\u306a\u308b\u30d6\u30e9\u30a6\u30b6\u3084\u30d0\u30fc\u30b8\u30e7\u30f3\u9593\u3067\u3001\u8868\u793a\u3055\u308c\u308b\u30b9\u30bf\u30a4\u30eb\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3084\u30e2\u30d0\u30a4\u30eb\u30d6\u30e9\u30a6\u30b6\u306a\u3069\u3067\u306f\u3001\u6700\u65b0\u306eCSS\u4ed5\u69d8\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u3001\u601d\u3044\u901a\u308a\u306e\u30c7\u30b6\u30a4\u30f3\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-big_icon_point wp-block-paragraph\"><strong>&lt;font>\u30bf\u30b0\u306f\u975e\u63a8\u5968<\/strong><br>\u30fb\u304b\u3064\u3066\u306f\u591a\u304f\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u305f\u304c\u3001HTML5\u4ee5\u964d\u3067\u306f \u975e\u63a8\u5968\u3002<br>\u30fb\u6700\u65b0\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u30b5\u30dd\u30fc\u30c8\u304c\u9650\u3089\u308c\u3066\u304a\u308a\u3001\u601d\u3044\u901a\u308a\u306e\u8868\u793a\u306b\u306a\u3089\u306a\u3044\u3053\u3068\u304c\u3042\u308b\u3002<br><br><strong>CSS\u306e\u8272\u6307\u5b9a\u306e\u6319\u52d5<\/strong><br>\u30fbcolor \u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4e00\u822c\u7684\u306b\u4f7f\u3048\u308b\u304c\u3001\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u540c\u3058\u89e3\u91c8\u3092\u3059\u308b\u3068\u306f\u9650\u3089\u306a\u3044\u3002<br>\u30fb\u65e7\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u8272\u8868\u73fe\u304c\u7570\u306a\u308b\u7d50\u679c\u306b\u306a\u308b\u3053\u3068\u3082\u3042\u308b\u3002<br><br><strong>\u8272\u6307\u5b9a\u65b9\u6cd5\u3054\u3068\u306e\u4e92\u63db\u6027<\/strong><br>\u30fbHEX\u30b3\u30fc\u30c9\uff08\u4f8b\uff1a#ff0000\uff09 \u2192 \u307b\u3068\u3093\u3069\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u5b89\u5b9a\u3057\u3066\u8868\u793a\u53ef\u80fd\u3002<br>\u30fbRGB \uff08\u4f8b\uff1argb(255, 0, 0)\uff09\u2192 \u307b\u307c\u3059\u3079\u3066\u306e\u30e2\u30c0\u30f3\u30d6\u30e9\u30a6\u30b6\u3067\u5229\u7528\u53ef\u80fd\u3002<br>\u30fbRGBA \uff08\u4f8b\uff1argba(255, 0, 0,0, 5)\uff09\u2192 \u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u975e\u5bfe\u5fdc\u306e\u53ef\u80fd\u6027\u3042\u308a\uff08\u900f\u660e\u5ea6\u304c\u52b9\u304b\u306a\u3044\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u306e\u305f\u3081\u3001\u8907\u96d1\u306a\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u5834\u5408\u306f\u3001<span class=\"swl-marker mark_yellow\"><strong>\u8907\u6570\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u30c6\u30b9\u30c8\u3092\u884c\u3044\u3001\u610f\u56f3\u3057\u305f\u901a\u308a\u306e\u8868\u793a\u304c\u3055\u308c\u308b\u304b\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u5fc5\u8981<\/strong><\/span>\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e92\u63db\u6027\u3092\u8003\u616e\u3057\u3001\u306a\u308b\u3079\u304f\u6700\u65b0\u306eCSS\u4ed5\u69d8\u3092\u53d6\u308a\u5165\u308c\u3064\u3064\u3082\u3001\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3059\u308b\u914d\u616e\u3082\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.13.05.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u7279\u306b\u3001\u30e2\u30d0\u30a4\u30eb\u30c7\u30d0\u30a4\u30b9\u3084\u4f4e\u901f\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u306b\u304a\u3044\u3066\u3082\u3001\u6587\u5b57\u306e\u8272\u304c\u6b63\u3057\u304f\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u3001\u8efd\u91cf\u306a\u30b9\u30bf\u30a4\u30eb\u306e\u6307\u5b9a\u3092\u5fc3\u639b\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3058\u3083\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>CSS\u3067\u6587\u5b57\u8272\u3092\u81ea\u7531\u306b\u5909\u3048\u308b\u5b9f\u8df5\u7684\u306a\u66f8\u304d\u65b9<\/strong><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1070\" height=\"702\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-28-14.38.55.png\" alt=\"CSS\u3067\u6587\u5b57\u8272\u3092\u81ea\u7531\u306b\u5909\u3048\u308b\u5b9f\u8df5\u7684\u306a\u66f8\u304d\u65b9\" class=\"wp-image-7853\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-28-14.38.55.png 1070w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-28-14.38.55-768x504.png 768w\" sizes=\"(max-width: 1070px) 100vw, 1070px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u306e\u57fa\u672c<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u3092\u4f7f\u3063\u3066\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u306f\u3001HTML\u3088\u308a\u3082\u52b9\u7387\u7684\u3067\u67d4\u8edf\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u521d\u5fc3\u8005\u3067\u3082\u7c21\u5358\u306b\u7406\u89e3\u3067\u304d\u308b\u57fa\u672c\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u304b\u3089\u59cb\u3081\u307e\u3057\u3087\u3046\u3002CSS\u3067\u306f\u3001color\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3057\u3001RGB\u5024\u300116\u9032\u6570\u306e\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u3001\u307e\u305f\u306f\u82f1\u8a9e\u306e\u8272\u540d\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306bCSS\u3067\u6587\u5b57\u306e\u8272\u3092\u8d64\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;p style=&quot;color: red;&quot;&gt;\u3053\u306e\u6587\u5b57\u306f\u8d64\u8272\u3067\u3059&lt;\/p&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u4f8b\u3067\u306f\u3001&lt;p&gt;\u30bf\u30b0\uff08\u6bb5\u843d\uff09\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u8d64\u8272\u306b\u3057\u3066\u3044\u307e\u3059\u3002CSS\u306estyle\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u3066\u3001HTML\u30bf\u30b0\u5185\u3067\u30b9\u30bf\u30a4\u30eb\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u306f\u3001\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u521d\u5fc3\u8005\u304c\u307e\u305a\u899a\u3048\u308b\u3079\u304d\u7c21\u5358\u306a\u65b9\u6cd5\u3067\u3001\u7279\u5b9a\u306e\u8981\u7d20\u306b\u3059\u3050\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3067\u304d\u308b\u305f\u3081\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3089\u306b\u3001CSS\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u8907\u6570\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u4e00\u5ea6\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306b&lt;style&gt;\u30bf\u30b0\u3092\u4f7f\u3063\u3066\u30da\u30fc\u30b8\u5168\u4f53\u306e\u6bb5\u843d\u306b\u8272\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;style&gt;\n\u00a0\u00a0p {\n\u00a0\u00a0\u00a0\u00a0color: blue;\n\u00a0\u00a0}\n&lt;\/style&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30da\u30fc\u30b8\u5185\u306e\u3059\u3079\u3066\u306e\u6bb5\u843d\u304c\u9752\u8272\u3067\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u5185\u90e8\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3068\u547c\u3073\u307e\u3059\u3002CSS\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u6587\u5b57\u306e\u8272\u3060\u3051\u3067\u306a\u304f\u3001\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3084\u80cc\u666f\u8272\u306a\u3069\u306e\u30b9\u30bf\u30a4\u30eb\u3082\u307e\u3068\u3081\u3066\u7ba1\u7406\u3067\u304d\u308b\u305f\u3081\u3001\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u30c7\u30b6\u30a4\u30f3\u304c\u7d71\u4e00\u3055\u308c\u3001\u4fdd\u5b88\u3082\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.09.27.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u306e\u57fa\u672c\u306f\u3001HTML\u30b3\u30fc\u30c9\u3068\u5206\u96e2\u3057\u3066\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u304c\u8aad\u307f\u3084\u3059\u304f\u306a\u308b\u3002\u521d\u5fc3\u8005\u306e\u3046\u3061\u306f\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u3092\u4f7f\u3046\u3053\u3068\u3082\u3042\u308b\u304c\u3001\u3088\u308a\u52b9\u7387\u7684\u306a\u65b9\u6cd5\u3068\u3057\u3066\u3001CSS\u3092\u5b66\u3073\u3001\u5916\u90e8\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u306a\u3069\u3092\u4f7f\u3046\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u308b\u305e\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>CSS\u306e\u57fa\u672c\u30eb\u30fc\u30eb\u3067\u8272\u3092\u6307\u5b9a\u3059\u308b<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u3092\u4f7f\u3063\u3066\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u969b\u3001\u57fa\u672c\u3068\u306a\u308b\u306e\u306fcolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002color\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3046\u3053\u3068\u306b\u3088\u308a\u3001\u30c6\u30ad\u30b9\u30c8\u306e\u8272\u3092\u7c21\u5358\u306b\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002\u6307\u5b9a\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u30ab\u30e9\u30fc\u540d\u300116\u9032\u6570\u3001RGB\uff08Red, Green, Blue\uff09\u306a\u3069\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u4f7f\u3044\u65b9\u3068\u57fa\u672c\u30eb\u30fc\u30eb\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8272\u540d\u3092\u4f7f\u3046<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><br><\/strong>CSS\u3067\u306f\u3001\u7c21\u5358\u306b\u6307\u5b9a\u3067\u304d\u308b\u6a19\u6e96\u7684\u306a\u8272\u540d\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6b21\u306e\u30b3\u30fc\u30c9\u3067\u306f\u6587\u5b57\u8272\u3092\u300c\u8d64\u300d\u306b\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>p {\n\u00a0\u00a0color: red;\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u5834\u5408\u3001&lt;p&gt;\u30bf\u30b0\uff08\u6bb5\u843d\uff09\u306e\u6587\u5b57\u306f\u8d64\u8272\u3067\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u8272\u540d\u3092\u4f7f\u3046\u65b9\u6cd5\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u3067\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u3044\u65b9\u6cd5\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u8272\u540d\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u304c\u9650\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u7d30\u304b\u306a\u8272\u6307\u5b9a\u306b\u306f\u4ed6\u306e\u65b9\u6cd5\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">16\u9032\u6570\u3092\u4f7f\u3046<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><br><\/strong>\u3088\u308a\u6b63\u78ba\u306a\u8272\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u300116\u9032\u6570\uff08Hex\u30b3\u30fc\u30c9\uff09\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6b21\u306e\u30b3\u30fc\u30c9\u306f\u6587\u5b57\u3092\u9752\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>h1 {\n\u00a0\u00a0color: #0000FF\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">16\u9032\u6570\u306f\u3001#\u306e\u5f8c\u306b6\u6841\u306e\u6570\u5b57\u3067\u8868\u3057\u307e\u3059\u3002\u6700\u521d\u306e2\u6841\u304c\u8d64\u3001\u6b21\u306e2\u6841\u304c\u7dd1\u3001\u6700\u5f8c\u306e2\u6841\u304c\u9752\u3092\u793a\u3057\u3066\u304a\u308a\u3001\u3053\u306e\u6570\u5024\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u3063\u3066\u8272\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001#000000\u306f\u9ed2\u3001#FFFFFF\u306f\u767d\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">RGB\u3092\u4f7f\u3046<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><br><\/strong>RGB\u5024\u3092\u4f7f\u3063\u305f\u8272\u6307\u5b9a\u3082\u53ef\u80fd\u3067\u3059\u3002\u3053\u3061\u3089\u3082\u6b63\u78ba\u306a\u8272\u6307\u5b9a\u304c\u3067\u304d\u3001\u900f\u660e\u5ea6\uff08RGBA\uff09\u3092\u52a0\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u4f8b\u3067\u306f\u3001RGB\u5024\u3092\u4f7f\u3063\u3066\u30c6\u30ad\u30b9\u30c8\u3092\u7dd1\u8272\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>span {\n\u00a0\u00a0color: rgb(0,128,0);\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">RGB\u306f\u305d\u308c\u305e\u308c0\u301c255\u306e\u7bc4\u56f2\u3067\u6307\u5b9a\u3067\u304d\u3001rgb(0,128,0)\u306f\u7dd1\u8272\u3092\u793a\u3057\u307e\u3059\u3002\u900f\u660e\u5ea6\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408\u3001rgba()\u3067\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">HSL (Hue, Saturation, Lightness)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><br><\/strong>\u8272\u76f8\u3001\u5f69\u5ea6\u3001\u660e\u5ea6\u3092\u4f7f\u3063\u3066\u8272\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u8272\u306e\u8abf\u6574\u304c\u3055\u3089\u306b\u7d30\u304b\u304f\u53ef\u80fd\u3067\u3059\u3002\u6b21\u306e\u4f8b\u3067\u306f\u3001\u9752\u307f\u306e\u5f37\u3044\u7dd1\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>div {\n\u00a0\u00a0color: hsl(120, 100%, 50%);\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u306f\u3001\u8272\u76f8120\u5ea6\uff08\u7dd1\uff09\u3001\u5f69\u5ea6100%\u3001\u660e\u5ea650%\u306e\u8272\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u306e\u57fa\u672c\u30eb\u30fc\u30eb\u3067\u6587\u5b57\u8272\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u306f\u975e\u5e38\u306b\u67d4\u8edf\u3067\u3001\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u30c7\u30b6\u30a4\u30f3\u306b\u7d71\u4e00\u611f\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5185\u90e8CSS\u3068\u5916\u90e8CSS\u306b\u3088\u308b\u9055\u3044<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u3067\u6587\u5b57\u306e\u8272\u3092\u6307\u5b9a\u3059\u308b\u969b\u3001CSS\u3092\u3069\u3053\u306b\u8a18\u8ff0\u3059\u308b\u304b\u306b\u3088\u3063\u3066<strong><span class=\"swl-marker mark_yellow\">\u300c\u5185\u90e8CSS\u300d\u3068\u300c\u5916\u90e8CSS\u300d\u306e2\u3064\u306e\u65b9\u6cd5<\/span><\/strong>\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u52b9\u7387\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u7ba1\u7406\u3084\u4fdd\u5b88\u6027\u306e\u5411\u4e0a\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u90e8CSS\u306f\u3001HTML\u30d5\u30a1\u30a4\u30eb\u5185\u306e&lt;head>\u30bf\u30b0\u306b\u76f4\u63a5\u30b9\u30bf\u30a4\u30eb\u3092\u8a18\u8ff0\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u6b21\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001&lt;style>\u30bf\u30b0\u3092\u4f7f\u3063\u3066HTML\u5185\u3067\u30b9\u30bf\u30a4\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;head&gt;\n\u00a0\u00a0&lt;style&gt;\n\u00a0\u00a0\u00a0\u00a0h1 {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0color: red;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0p {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0color: blue;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0&lt;\/style&gt;\n&lt;\/head&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u90e8CSS\u306f\u3001\u7279\u5b9a\u306eHTML\u30d5\u30a1\u30a4\u30eb\u5185\u3067\u306e\u307f\u4f7f\u7528\u3055\u308c\u3001\u6bd4\u8f03\u7684\u5c0f\u898f\u6a21\u306a\u30b5\u30a4\u30c8\u3084\u5358\u4e00\u306e\u30da\u30fc\u30b8\u306b\u9069\u7528\u3059\u308b\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002\u7c21\u5358\u306a\u30da\u30fc\u30b8\u69cb\u6210\u3084\u8fc5\u901f\u306a\u4fee\u6b63\u306b\u306f\u6709\u52b9\u3067\u3059\u304c\u3001\u8907\u6570\u306e\u30da\u30fc\u30b8\u306b\u307e\u305f\u304c\u3063\u3066\u540c\u3058\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u975e\u52b9\u7387\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3067\u3001\u5916\u90e8CSS\u306f\u3001\u5225\u306e\u30d5\u30a1\u30a4\u30eb\uff08\u901a\u5e38\u306f.css\u30d5\u30a1\u30a4\u30eb\uff09\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u8a18\u8ff0\u3057\u3001\u305d\u308c\u3092HTML\u30d5\u30a1\u30a4\u30eb\u306b\u30ea\u30f3\u30af\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002HTML\u30d5\u30a1\u30a4\u30eb\u306e&lt;head&gt;\u30bf\u30b0\u5185\u306b&lt;link&gt;\u30bf\u30b0\u3092\u4f7f\u3063\u3066\u5916\u90e8CSS\u3092\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;head&gt;\n\u00a0\u00a0&lt;link rel=&quot;stylesheet&quot; href=&quot;styles.css&quot;&gt;\n&lt;\/head&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5916\u90e8CSS\u306f\u3001\u8907\u6570\u306e\u30da\u30fc\u30b8\u306b\u540c\u3058\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u969b\u306b\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3001\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u3061\u3064\u3064\u3001\u30b9\u30bf\u30a4\u30eb\u306e\u7ba1\u7406\u304c\u5bb9\u6613\u306b\u306a\u308a\u3001CSS\u30d5\u30a1\u30a4\u30eb\u304c\u5225\u306b\u5206\u304b\u308c\u3066\u3044\u308b\u305f\u3081\u3001HTML\u30b3\u30fc\u30c9\u304c\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308a\u3001\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u90e8CSS\u306f\u3001\u8fc5\u901f\u306a\u5909\u66f4\u304c\u5fc5\u8981\u306a\u5358\u4e00\u30da\u30fc\u30b8\u3067\u306e\u5229\u7528\u306b\u9069\u3057\u3066\u3044\u308b\u4e00\u65b9\u3067\u3001\u5916\u90e8CSS\u306f\u5927\u898f\u6a21\u306a\u30b5\u30a4\u30c8\u3084\u8907\u6570\u30da\u30fc\u30b8\u306b\u5171\u901a\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u969b\u306b\u63a8\u5968\u3055\u308c\u307e\u3059\u3002\u7279\u306b\u3001<span class=\"swl-marker mark_yellow\"><strong>\u5916\u90e8CSS\u3092\u4f7f\u3046\u3068\u30011\u3064\u306e\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3067\u5168\u4f53\u306e\u30c7\u30b6\u30a4\u30f3\u3092\u7d71\u4e00\u3067\u304d\u308b<\/strong><\/span>\u305f\u3081\u3001\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.12.07.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u5185\u90e8CSS\u3068\u5916\u90e8CSS\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u76ee\u7684\u3084\u898f\u6a21\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3058\u3083\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>HTML\u3068CSS\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\uff1f\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u6bd4\u8f03<\/strong><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"964\" height=\"636\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-28-14.41.21.png\" alt=\"HTML\u3068CSS\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\uff1f\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u6bd4\u8f03\" class=\"wp-image-7854\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-28-14.41.21.png 964w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/09\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2024-12-28-14.41.21-768x507.png 768w\" sizes=\"(max-width: 964px) 100vw, 964px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>HTML\u30bf\u30b0\u3068CSS\u306e\u5f79\u5272<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3068CSS\u306f\u3001Web\u30b5\u30a4\u30c8\u306e\u69cb\u9020\u3068\u30c7\u30b6\u30a4\u30f3\u3092\u69cb\u7bc9\u3059\u308b\u4e0a\u3067\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u307e\u305a\u3001HTML\u306fWeb\u30da\u30fc\u30b8\u306e\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u8a00\u8a9e\u3067\u3059\u3002HTML\u30bf\u30b0\u3092\u4f7f\u3063\u3066\u3001\u30da\u30fc\u30b8\u306e\u898b\u51fa\u3057\u3001\u6bb5\u843d\u3001\u30ea\u30b9\u30c8\u3001\u30ea\u30f3\u30af\u3001\u753b\u50cf\u306a\u3069\u306e\u8981\u7d20\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3067\u3001\u898b\u51fa\u3057\u3068\u6bb5\u843d\u304c\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;h1&gt;Web\u30c7\u30b6\u30a4\u30f3\u306e\u57fa\u672c&lt;\/h1&gt;\n&lt;p&gt;HTML\u3068CSS\u3092\u5b66\u3076\u3053\u3068\u306f\u3001Web\u30b5\u30a4\u30c8\u4f5c\u6210\u306e\u7b2c\u4e00\u6b69\u3067\u3059\u3002&lt;\/p&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u4f8b\u3067\u306f\u3001&lt;h1&gt;\u30bf\u30b0\u304c\u898b\u51fa\u3057\u3092\u3001&lt;p&gt;\u30bf\u30b0\u304c\u6bb5\u843d\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002HTML\u306e\u5f79\u5272\u306f\u3001\u3053\u306e\u3088\u3046\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u69cb\u9020\u3092\u5b9a\u7fa9\u3057\u3001\u30da\u30fc\u30b8\u4e0a\u306b\u3069\u306e\u3088\u3046\u306a\u60c5\u5831\u304c\u5b58\u5728\u3059\u308b\u304b\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3001CSS\u306f\u3001HTML\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u69cb\u9020\u306b\u30c7\u30b6\u30a4\u30f3\u3084\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u305f\u3081\u306e\u8a00\u8a9e\u3067\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u6587\u5b57\u306e\u8272\u3001\u30d5\u30a9\u30f3\u30c8\u306e\u30b5\u30a4\u30ba\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u3001\u4f59\u767d\u3001\u80cc\u666f\u8272\u306a\u3069\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002CSS\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001Web\u30da\u30fc\u30b8\u304c\u8996\u899a\u7684\u306b\u6574\u3063\u305f\u30c7\u30b6\u30a4\u30f3\u306b\u306a\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306f\u3001\u4e0a\u8a18\u306eHTML\u306bCSS\u3092\u4f7f\u3063\u3066\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u305f\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>h1 {\n\u00a0\u00a0color: blue;\n\u00a0\u00a0font-size: 24px;\n}\np {\n\u00a0\u00a0color: gray;\n\u00a0\u00a0font-size: 16px;\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306eCSS\u306f\u3001\u898b\u51fa\u3057\uff08&lt;h1&gt;\uff09\u3092\u9752\u8272\u3001\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u309224px\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u6bb5\u843d\uff08&lt;p&gt;\uff09\u306e\u6587\u5b57\u8272\u3092\u7070\u8272\u3001\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u309216px\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002HTML\u3067\u30da\u30fc\u30b8\u306e\u69cb\u9020\u3092\u5b9a\u7fa9\u3057\u3001CSS\u3067\u305d\u306e\u69cb\u9020\u306b\u30c7\u30b6\u30a4\u30f3\u3092\u65bd\u3059\u3068\u3044\u3046\u5f79\u5272\u5206\u62c5\u304c\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.12.07.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>HTML\u304c\u300c\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u9aa8\u7d44\u307f\u300d\u3092\u4f5c\u308a\u3001CSS\u304c\u305d\u306e\u4e0a\u306b\u300c\u30c7\u30b6\u30a4\u30f3\u306e\u88c5\u98fe\u300d\u3092\u65bd\u3059\u3068\u3044\u3046\u8003\u3048\u65b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306bWeb\u30c7\u30b6\u30a4\u30f3\u3092\u69cb\u7bc9\u3067\u304d\u308b\u3002HTML\u3068CSS\u306e\u5f79\u5272\u3092\u660e\u78ba\u306b\u533a\u5225\u3059\u308b\u3053\u3068\u304c\u3001\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u9375\u3068\u306a\u308b\u305e\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\"><strong>\u52b9\u7387\u7684\u306b\u4f7f\u3046\u305f\u3081\u306e\u30dd\u30a4\u30f3\u30c8<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. HTML\u3067\u5fc5\u8981\u6700\u4f4e\u9650\u306e\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3067\u306f\u3001\u30da\u30fc\u30b8\u306e\u898b\u51fa\u3057\u3084\u6bb5\u843d\u3001\u30ea\u30f3\u30af\u3001\u30ea\u30b9\u30c8\u306a\u3069\u306e\u69cb\u9020\u3092\u9069\u5207\u306b\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002\u7121\u99c4\u306a\u30bf\u30b0\u3084\u5197\u9577\u306a\u8a18\u8ff0\u3092\u907f\u3051\u3001\u30b7\u30f3\u30d7\u30eb\u304b\u3064\u610f\u5473\u306e\u3042\u308b\u69cb\u9020\u3092\u4f5c\u308b\u3053\u3068\u3067\u3001SEO\uff08\u30b5\u30a4\u30c8\u306e\u691c\u7d22\u9806\u4f4d\uff09\u306b\u3082\u6709\u5229\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u898b\u51fa\u3057\u30bf\u30b0\uff08&lt;h1&gt;\u301c&lt;h6&gt;\uff09\u306f\u30da\u30fc\u30b8\u306e\u968e\u5c64\u69cb\u9020\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u4f7f\u3044\u3001\u898b\u51fa\u3057\u3092\u6b63\u3057\u304f\u4f7f\u3046\u3053\u3068\u3067\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u304c\u30da\u30fc\u30b8\u5185\u5bb9\u3092\u3088\u308a\u7406\u89e3\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2. CSS\u3092\u4f7f\u3063\u3066\u4e00\u5143\u7ba1\u7406\u3059\u308b<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u3067\u306f\u3001\u6587\u5b57\u306e\u8272\u3084\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3001\u4f59\u767d\u3084\u80cc\u666f\u8272\u306a\u3069\u3092\u4e00\u5143\u7ba1\u7406\u3067\u304d\u307e\u3059\u3002\u5916\u90e8\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u6570\u306e\u30da\u30fc\u30b8\u306b\u308f\u305f\u3063\u3066\u540c\u3058\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3067\u304d\u3001\u4fdd\u5b88\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5168\u30da\u30fc\u30b8\u3067\u5171\u901a\u3059\u308b\u30b9\u30bf\u30a4\u30eb\u306f\u5916\u90e8CSS\u30d5\u30a1\u30a4\u30eb\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u3067\u30011\u3064\u306e\u5909\u66f4\u304c\u5168\u30da\u30fc\u30b8\u306b\u53cd\u6620\u3055\u308c\u308b\u305f\u3081\u3001\u52b9\u7387\u7684\u306a\u4f5c\u696d\u304c\u53ef\u80fd\u3067\u3059\u3002\u307e\u305f\u3001CSS\u30af\u30e9\u30b9\u3092\u6d3b\u7528\u3057\u3066\u3001\u540c\u3058\u30b9\u30bf\u30a4\u30eb\u3092\u8907\u6570\u306e\u8981\u7d20\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u7c21\u6f54\u5316\u304c\u56f3\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>3. \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u3092\u53d6\u308a\u5165\u308c\u308b<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u73fe\u4ee3\u306eWeb\u30c7\u30b6\u30a4\u30f3\u3067\u306f\u3001PC\u3084\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u306a\u3069\u7570\u306a\u308b\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u5fdc\u3057\u305f\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002CSS\u306e\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3063\u3066\u3001\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u305f\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306bCSS\u306b\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u3001\u753b\u9762\u5e45\u304c600px\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u6587\u5b57\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>@media (max-width: 600px) {\n\u00a0\u00a0body {\n\u00a0\u00a0\u00a0\u00a0font-size: 14px;\n\u00a0\u00a0}\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u3069\u306e\u30c7\u30d0\u30a4\u30b9\u3067\u95b2\u89a7\u3057\u3066\u3082\u898b\u3084\u3059\u3044\u30c7\u30b6\u30a4\u30f3\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/withcode.tech\/media\/how-to-create-responsive-design\/\">\u5b9f\u8df5\u30ac\u30a4\u30c9\uff01\u30b9\u30de\u30db\u30fb\u30bf\u30d6\u30ec\u30c3\u30c8\u306b\u5bfe\u5fdc\u3059\u308b\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u4f5c\u6210\u65b9\u6cd5<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-withcode-media wp-block-embed-withcode-media\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/withcode.tech\/media\/how-to-create-responsive-design\/\n<\/div><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>4. HTML\u3068CSS\u3092\u5206\u96e2\u3057\u3066\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u5185\u306b\u76f4\u63a5\u30b9\u30bf\u30a4\u30eb\u3092\u8a18\u8ff0\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30b9\u30bf\u30a4\u30eb\u306fCSS\u306b\u307e\u3068\u3081\u3066\u7ba1\u7406\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002HTML\u30b3\u30fc\u30c9\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u69cb\u9020\u306b\u96c6\u4e2d\u3067\u304d\u3001CSS\u3067\u30c7\u30b6\u30a4\u30f3\u304c\u4e00\u62ec\u7ba1\u7406\u3055\u308c\u308b\u305f\u3081\u3001\u4f5c\u696d\u306e\u5206\u62c5\u304c\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u7279\u306b\u5927\u898f\u6a21\u306a\u30b5\u30a4\u30c8\u3067\u306f\u3001\u3053\u306e\u65b9\u6cd5\u304c\u4fdd\u5b88\u6027\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u306e\u3067\u975e\u5e38\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306b\u3001HTML\u3068CSS\u3092\u52b9\u7387\u7684\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u898b\u3084\u3059\u304f\u3001\u6a5f\u80fd\u7684\u306aWeb\u30b5\u30a4\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30da\u30f3\u535a\u58eb\u3001HTML\u3068\u8272\u3092\u5909\u3048\u308b\u65b9\u6cd5\u3068\u3001CSS\u3067<strong>\u8272\u3092\u5909\u3048\u308b\u65b9\u6cd5<\/strong>\u306e\u9055\u3044\u304c\u3084\u3063\u3068\u5206\u304b\u308a\u307e\u3057\u305f\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.08.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u306e\u610f\u6c17\u3058\u3083\u3002\u6700\u521d\u306f\u5c0f\u3055\u306a\u5b9f\u88c5\u304b\u3089\u3067\u3088\u3044\u3002\u3060\u304c\u3001\u8272\u3092\u5909\u3048\u308b\u4ed5\u7d44\u307f\u3092\u4f53\u7cfb\u7684\u306b\u7406\u89e3\u3059\u308c\u3070\u3001\u3069\u3093\u306a\u30c7\u30b6\u30a4\u30f3\u306b\u3082\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u305e\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.06.05.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff01\u3068\u3066\u3082\u52c9\u5f37\u306b\u306a\u308a\u307e\u3057\u305f\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">\u7279\u5b9a\u306e\u6587\u5b57\u30fb\u4e00\u90e8\u3060\u3051\u8272\u3092\u5909\u3048\u308b\u65b9\u6cd5\uff08span\u6d3b\u7528\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u6587\u7ae0\u306e\u4e2d\u306e\u7279\u5b9a\u306e\u5358\u8a9e\u3060\u3051\u8272\u3092\u5909\u3048\u305f\u3044\u300d\u3068\u3044\u3046\u5834\u9762\u3067\u306f\u3001<code>&lt;span&gt;<\/code>\u30bf\u30b0\u3067\u5bfe\u8c61\u90e8\u5206\u3060\u3051\u3092\u56f2\u307f\u3001CSS\u3067\u8272\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u6bb5\u843d\u5168\u4f53\u3067\u306f\u306a\u304f\u201c\u4e00\u90e8\u3060\u3051\u201d\u30d4\u30f3\u30dd\u30a4\u30f3\u30c8\u306b\u88c5\u98fe\u3067\u304d\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u7ae0\u306e\u4e00\u90e8\u3060\u3051\u8272\u3092\u5909\u3048\u308b\uff08\u30a4\u30f3\u30e9\u30a4\u30f3span\uff09<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;p&gt;\u3053\u308c\u306f&lt;span style=\"color: #e53935;\"&gt;\u91cd\u8981\u306a\u90e8\u5206&lt;\/span&gt;\u3060\u3051\u8d64\u8272\u306b\u3057\u305f\u4f8b\u3067\u3059\u3002&lt;\/p&gt;<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CSS\u30af\u30e9\u30b9\u3067\u7e70\u308a\u8fd4\u3057\u4f7f\u3046\u8272\u3092\u7ba1\u7406\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u3058\u8272\u3092\u4f55\u5ea6\u3082\u4f7f\u3046\u306a\u3089\u3001\u30a4\u30f3\u30e9\u30a4\u30f3style\u3067\u306f\u306a\u304f\u30af\u30e9\u30b9\u3067\u7ba1\u7406\u3059\u308b\u3068\u4fdd\u5b88\u6027\u304c\u4e0a\u304c\u308a\u307e\u3059\u3002\u8272\u3092\u5909\u3048\u305f\u3044\u3068\u304d\u306fCSS\u306e1\u304b\u6240\u3092\u76f4\u3059\u3060\u3051\u3067\u5168\u30da\u30fc\u30b8\u306b\u53cd\u6620\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;style&gt;\n  .text-red  { color: #e53935; }\n  .text-blue { color: #1e88e5; }\n&lt;\/style&gt;\n\n&lt;p&gt;\u3053\u3053\u306f&lt;span class=\"text-red\"&gt;\u8d64\u8272&lt;\/span&gt;\u3001\u3053\u3053\u306f&lt;span class=\"text-blue\"&gt;\u9752\u8272&lt;\/span&gt;\u3067\u3059\u3002&lt;\/p&gt;<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u592a\u5b57\u30fb\u30de\u30fc\u30ab\u30fc\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u5f37\u8abf\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8272\u3060\u3051\u3067\u306a\u304f\u592a\u5b57\u3084\u30de\u30fc\u30ab\u30fc\u98a8\u306e\u80cc\u666f\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u3088\u308a\u8996\u7dda\u3092\u96c6\u3081\u3089\u308c\u307e\u3059\u3002\u4f7f\u3044\u3059\u304e\u308b\u3068\u9006\u306b\u8aad\u307f\u306b\u304f\u304f\u306a\u308b\u305f\u3081\u30011\u753b\u9762\u306b1\u301c2\u304b\u6240\u3092\u76ee\u5b89\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;p&gt;\u7d50\u8ad6\u306f&lt;strong style=\"color:#e53935;\"&gt;\u3053\u3053\u304c\u6700\u91cd\u8981&lt;\/strong&gt;\u3067\u3059\u3002&lt;\/p&gt;\n&lt;p&gt;\u6b21\u306b&lt;span style=\"background: linear-gradient(transparent 60%, #fff59d 60%);\"&gt;\u30de\u30fc\u30ab\u30fc\u98a8\u306e\u5f37\u8abf&lt;\/span&gt;\u3082\u52b9\u679c\u7684\u3067\u3059\u3002&lt;\/p&gt;<\/code><\/pre><\/div>\n\n\n\n\n\n<!-- addon:6423-v1 -->\n<h2 class=\"wp-block-heading\">\u30b3\u30d4\u30da\u3067\u4f7f\u3048\u308b\u6587\u5b57\u8272\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u65e9\u898b\u8868<\/h2>\n<p>\u300c\u8272\u306e\u540d\u524d\u306f\u5206\u304b\u308b\u3051\u3069\u30b3\u30fc\u30c9\u304c\u601d\u3044\u51fa\u305b\u306a\u3044\u300d\u3068\u3044\u3046\u3068\u304d\u306e\u305f\u3081\u306e\u65e9\u898b\u8868\u3067\u3059\u3002HEX\u30b3\u30fc\u30c9\uff08<code>#<\/code>\u3067\u59cb\u307e\u308b6\u6841\uff09\u3092\u305d\u306e\u307e\u307e <code>color<\/code> \u306b\u30b3\u30d4\u30da\u3059\u308c\u3070\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8272\u540d<\/th><th>\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9<\/th><th>\u4f7f\u3044\u3069\u3053\u308d<\/th><\/tr><\/thead><tbody><tr><td>\u30d9\u30fc\u30b9\u306e\u9ed2\uff08\u63a8\u5968\uff09<\/td><td>#333333<\/td><td>\u672c\u6587\u30c6\u30ad\u30b9\u30c8\u3002\u771f\u3063\u9ed2\u3088\u308a\u76ee\u306b\u512a\u3057\u3044<\/td><\/tr><tr><td>\u3084\u3084\u8584\u3044\u30b0\u30ec\u30fc<\/td><td>#666666<\/td><td>\u88dc\u8db3\u30fb\u30ad\u30e3\u30d7\u30b7\u30e7\u30f3<\/td><\/tr><tr><td>\u8d64\uff08\u5f37\u8abf\uff09<\/td><td>#e53935<\/td><td>\u6ce8\u610f\u66f8\u304d\u30fb\u91cd\u8981\u8a9e\u53e5<\/td><\/tr><tr><td>\u9752\uff08\u30ea\u30f3\u30af\u8abf\uff09<\/td><td>#1976d2<\/td><td>\u30ea\u30f3\u30af\u30fb\u898b\u51fa\u3057<\/td><\/tr><tr><td>\u7dd1\uff08\u6210\u529f\uff09<\/td><td>#43a047<\/td><td>OK\u30fb\u30dd\u30b8\u30c6\u30a3\u30d6\u8868\u73fe<\/td><\/tr><tr><td>\u30aa\u30ec\u30f3\u30b8<\/td><td>#fb8c00<\/td><td>\u30dc\u30bf\u30f3\u30fbCTA<\/td><\/tr><tr><td>\u767d<\/td><td>#ffffff<\/td><td>\u6fc3\u3044\u80cc\u666f\u4e0a\u306e\u6587\u5b57<\/td><\/tr><\/tbody><\/table><\/figure>\n<p>\u4f7f\u3044\u65b9\u306fHEX\u30b3\u30fc\u30c9\u3092 <code>color<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5165\u308c\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;p style=&quot;color: #e53935;&quot;&gt;\u8d64\u3044\u6ce8\u610f\u6587&lt;\/p&gt;\n&lt;p style=&quot;color: #1976d2;&quot;&gt;\u9752\u3044\u898b\u51fa\u3057\u98a8&lt;\/p&gt;<\/code><\/pre><\/div>\n<h2 class=\"wp-block-heading\">\u30102026\u5e74\u6700\u65b0\u3011color-mix\u30fb\u76f8\u5bfe\u8272\u30fblight-dark \u3067\u8272\u3092\u3082\u3063\u3068\u81ea\u5728\u306b\u6271\u3046<\/h2>\n\n<p class=\"wp-block-paragraph\">2024\u5e74\u4ee5\u964d\u3001CSS\u306e\u8272\u6307\u5b9a\u306f\u5927\u304d\u304f\u9032\u5316\u3057\u307e\u3057\u305f\u3002<strong><span class=\"swl-marker mark_yellow\">\u8272\u3092\u6df7\u305c\u308b\u30fb\u65e2\u5b58\u306e\u8272\u304b\u3089\u4f5c\u308b\u30fb\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067\u81ea\u52d5\u5207\u66ff\u3059\u308b<\/span><\/strong>\u3068\u3044\u3063\u305f\u51e6\u7406\u304c\u3001JavaScript\u3084\u30d7\u30ea\u30d7\u30ed\u30bb\u30c3\u30b5\u306a\u3057\u306eCSS\u3060\u3051\u3067\u5b8c\u7d50\u3057\u307e\u3059\u3002\u6587\u5b57\u8272\u306e\u8868\u73fe\u306e\u5e45\u304c\u4e00\u6c17\u306b\u5e83\u304c\u308b\u306e\u3067\u3001\u305c\u3072\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n<h3 class=\"wp-block-heading\">color-mix() \u30672\u8272\u3092\u6df7\u305c\u308b<\/h3>\n\n<p class=\"wp-block-paragraph\"><code>color-mix()<\/code> \u306f2\u3064\u306e\u8272\u3092\u6307\u5b9a\u3057\u305f\u5272\u5408\u3067\u6df7\u305c\u3089\u308c\u308b\u95a2\u6570\u3067\u3059\u3002\u300c\u30e1\u30a4\u30f3\u30ab\u30e9\u30fc\u309220%\u3060\u3051\u767d\u306b\u5bc4\u305b\u305f\u8584\u3044\u6587\u5b57\u8272\u300d\u306a\u3069\u3092\u30b3\u30fc\u30c9\u4e0a\u3067\u8a08\u7b97\u3067\u304d\u3001\u30d1\u30ec\u30c3\u30c8\u306e\u7d71\u4e00\u611f\u304c\u4fdd\u3066\u307e\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.text-soft {\n  \/* \u30d6\u30e9\u30f3\u30c9\u8272\u309220%\u3060\u3051\u767d\u306b\u5bc4\u305b\u3066\u3001\u5c11\u3057\u6de1\u3044\u6587\u5b57\u8272\u306b\u3059\u308b *\/\n  color: color-mix(in srgb, #d16176 80%, white);\n}<\/code><\/pre><\/div>\n\n<h3 class=\"wp-block-heading\">\u76f8\u5bfe\u8272\u69cb\u6587\uff08Relative Color\uff09\u3067\u65e2\u5b58\u8272\u304b\u3089\u4f5c\u308b<\/h3>\n\n<p class=\"wp-block-paragraph\"><code>rgb(from ...)<\/code> \u3084 <code>hsl(from ...)<\/code> \u3092\u4f7f\u3046\u3068\u3001<strong>\u3042\u308b\u8272\u3092\u57fa\u6e96\u306b\u660e\u5ea6\u3084\u5f69\u5ea6\u3060\u3051\u3092\u5909\u3048\u305f\u6d3e\u751f\u8272<\/strong>\u3092\u4f5c\u308c\u307e\u3059\u3002\u30db\u30d0\u30fc\u6642\u306b\u5c11\u3057\u6697\u304f\u3059\u308b\u3001\u3068\u3044\u3063\u305f\u51e6\u7406\u304cCSS\u5909\u6570\u3068\u76f8\u6027\u629c\u7fa4\u3067\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>:root { --brand: #d16176; }\n\n.link:hover {\n  \/* \u57fa\u6e96\u8272\u306e\u660e\u5ea6(l)\u30920.8\u500d\u306b\u843d\u3068\u3057\u3066\u3001\u30db\u30d0\u30fc\u6642\u3060\u3051\u6fc3\u304f\u3059\u308b *\/\n  color: hsl(from var(--brand) h s calc(l * 0.8));\n}<\/code><\/pre><\/div>\n\n<h3 class=\"wp-block-heading\">light-dark() \u3067\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u6587\u5b57\u8272\u30921\u884c\u3067\u5207\u66ff<\/h3>\n\n<p class=\"wp-block-paragraph\"><code>light-dark()<\/code> \u3092\u4f7f\u3048\u3070\u3001\u30e9\u30a4\u30c8\uff0f\u30c0\u30fc\u30af\u305d\u308c\u305e\u308c\u306e\u6587\u5b57\u8272\u30921\u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u307e\u3068\u3081\u3066\u66f8\u3051\u307e\u3059\u3002\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u5897\u3084\u3055\u305a\u306b\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>:root { color-scheme: light dark; }\n\nbody {\n  \/* \u660e\u308b\u3044\u30c6\u30fc\u30de\u306a\u3089#222\u3001\u6697\u3044\u30c6\u30fc\u30de\u306a\u3089#eee \u3092\u81ea\u52d5\u9078\u629e *\/\n  color: light-dark(#222, #eee);\n}<\/code><\/pre><\/div>\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u306f<strong><span class=\"swl-marker mark_yellow\">Chrome\u30fbEdge\u30fbSafari\u30fbFirefox \u306e\u6700\u65b0\u7248\u3067\u5229\u7528\u53ef\u80fd<\/span><\/strong>\u3067\u3059\u3002\u672a\u5bfe\u5fdc\u74b0\u5883\u304c\u5fc3\u914d\u306a\u5834\u5408\u306f\u3001<code>@supports (color: color-mix(in srgb, red, blue))<\/code> \u3067\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7528\u610f\u3057\u3066\u304a\u304f\u3068\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u6587\u5b57\u8272\u304c\u5909\u308f\u3089\u306a\u3044\u3068\u304d\u306e5\u3064\u306e\u5bfe\u51e6\u6cd5<\/h2>\n<p>\u300c<code>color<\/code>\u3092\u66f8\u3044\u305f\u306e\u306b\u8272\u304c\u53cd\u6620\u3055\u308c\u306a\u3044\u300d\u3068\u3044\u3046\u30c8\u30e9\u30d6\u30eb\u306f\u521d\u5fc3\u8005\u306b\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u6b21\u306e\u9806\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul class=\"wp-block-list\"><li><strong>\u30b9\u30da\u30eb\u30df\u30b9<\/strong>\uff1a<code>color<\/code>\u3092<code>colour<\/code>\u3068\u66f8\u3044\u3066\u3044\u306a\u3044\u304b\u3001\u672b\u5c3e\u306e<code>;<\/code>\u304c\u629c\u3051\u3066\u3044\u306a\u3044\u304b\u3002<\/li><li><strong>\u512a\u5148\u9806\u4f4d\uff08\u8a73\u7d30\u5ea6\uff09<\/strong>\uff1a\u4ed6\u306eCSS\u304c\u5f8c\u304b\u3089\u4e0a\u66f8\u304d\u3057\u3066\u3044\u308b\u3002\u3088\u308a\u8a73\u7d30\u306a\u30bb\u30ec\u30af\u30bf\u304b<code>!important<\/code>\u3067\u5bfe\u51e6\u3002<\/li><li><strong>\u5916\u90e8CSS\u306e\u8aad\u307f\u8fbc\u307f<\/strong>\uff1a<code>&lt;link&gt;<\/code>\u306e\u30d1\u30b9\u304c\u9593\u9055\u3063\u3066\u3044\u306a\u3044\u304b\u3002<\/li><li><strong>\u30d6\u30e9\u30a6\u30b6\u30ad\u30e3\u30c3\u30b7\u30e5<\/strong>\uff1a\u30b9\u30fc\u30d1\u30fc\u30ea\u30ed\u30fc\u30c9\uff08Ctrl\/Cmd+Shift+R\uff09\u3067\u518d\u8aad\u307f\u8fbc\u307f\u3002<\/li><li><strong>\u30a4\u30f3\u30e9\u30a4\u30f3style\u306e\u4e0a\u66f8\u304d<\/strong>\uff1aHTML\u5074\u306e<code>style=&quot;&quot;<\/code>\u304c\u6700\u512a\u5148\u3067\u52dd\u3064\u70b9\u306b\u6ce8\u610f\u3002<\/li><\/ul>\n<p>\u3069\u3046\u3057\u3066\u3082\u4e0a\u66f8\u304d\u3057\u305f\u3044\u5834\u5408\u306f<code>!important<\/code>\u304c\u6709\u52b9\u3067\u3059\u304c\u3001\u591a\u7528\u306f\u4fdd\u5b88\u6027\u3092\u4e0b\u3052\u308b\u306e\u3067\u6700\u7d42\u624b\u6bb5\u306b\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.text {\n  color: red;      \/* \u52b9\u304b\u306a\u3044\uff1f *\/\n}\n.text {\n  color: blue !important;  \/* \u512a\u5148\u5ea6\u3092\u4e0a\u3052\u3066\u4e0a\u66f8\u304d *\/\n}<\/code><\/pre><\/div>\n\n<h2 class=\"wp-block-heading\"><strong>\u307e\u3068\u3081\uff1a\u6587\u5b57\u8272\u5909\u66f4\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3068CSS\u3092\u4f7f\u3063\u305f\u6587\u5b57\u306e\u8272\u6307\u5b9a\u306f\u3001\u521d\u5fc3\u8005\u306b\u3068\u3063\u3066\u3082\u7406\u89e3\u3057\u3084\u3059\u3044\u57fa\u672c\u7684\u306a\u30b9\u30ad\u30eb\u3067\u3059\u3002\u672c\u8a18\u4e8b\u306e\u8981\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-big_icon_check wp-block-paragraph\"><strong>&lt;font>\u30bf\u30b0\u306e\u73fe\u72b6<\/strong><br>\u30fb\u304b\u3064\u3066\u306f\u6587\u5b57\u8272\u3092\u7c21\u5358\u306b\u5909\u66f4\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u305f<br>\u30fb\u73fe\u5728\u306f\u975e\u63a8\u5968\uff08HTML5\u4ee5\u964d\u3067\u306f\u4f7f\u308f\u306a\u3044\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u308b\uff09<br><br><strong>CSS\u3067\u306e\u8272\u6307\u5b9a\u306e\u30e1\u30ea\u30c3\u30c8<\/strong><br>\u30fbcolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3063\u3066\u52b9\u7387\u7684\u306b\u6587\u5b57\u306e\u8272\u3092\u5909\u66f4\u3067\u304d\u308b<br>\u30fb\u5185\u90e8CSS\u3068\u5916\u90e8CSS\u3092\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u67d4\u8edf\u306b\u7ba1\u7406\u53ef\u80fd<br>\u30fb\u30b9\u30bf\u30a4\u30eb\u306e\u4e00\u5143\u7ba1\u7406\u304c\u3067\u304d\u3001\u5927\u898f\u6a21\u30b5\u30a4\u30c8\u3067\u3082\u52b9\u7387\u7684\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3067\u304d\u308b<br><br><strong>\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3082\u53ef\u80fd<\/strong><br>\u30fbCSS\u3092\u7528\u3044\u308c\u3070\u3001PC\u30fb\u30b9\u30de\u30db\u30fb\u30bf\u30d6\u30ec\u30c3\u30c8\u306a\u3069\u3055\u307e\u3056\u307e\u306a\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u5fdc<br>\u30fb\u30c7\u30b6\u30a4\u30f3\u3092\u7d71\u4e00\u3057\u3064\u3064\u3001\u753b\u9762\u30b5\u30a4\u30ba\u3054\u3068\u306b\u6700\u9069\u306a\u8868\u793a\u3092\u5b9f\u73fe\u3067\u304d\u308b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTML\u3068CSS\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u3046\u3053\u3068\u304c\u3001<span class=\"swl-marker mark_yellow\"><strong>\u30c7\u30b6\u30a4\u30f3\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u3061\u3064\u3064\u3001\u8aad\u307f\u3084\u3059\u304f\u3001\u9b45\u529b\u7684\u306aWeb\u30da\u30fc\u30b8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/strong><\/span>\u3067\u3059\u3002HTML\u304c\u69cb\u9020\u3092\u4f5c\u308a\u3001CSS\u304c\u30b9\u30bf\u30a4\u30eb\u3092\u63d0\u4f9b\u3059\u308b\u3068\u3044\u3046\u5f79\u5272\u5206\u62c5\u3092\u7406\u89e3\u3057\u3001\u67d4\u8edf\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001Web\u30c7\u30b6\u30a4\u30f3\u306e\u30b9\u30ad\u30eb\u306e\u5411\u4e0a\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u65b9\u6cd5\u3092\u305c\u3072\u3054\u6d3b\u7528\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<!-- withmedia-related -->\n<h2 class=\"wp-block-heading\">\u95a2\u9023\u8a18\u4e8b<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/withcode.tech\/media\/jamstackform-explanation\/\">Jamstack\u30d5\u30a9\u30fc\u30e0\u51e6\u7406\u30102026\u5e74\u7248\u3011\u30b5\u30fc\u30d0\u30fc\u30ec\u30b9\u5b9f\u88c5\u5b8c\u5168\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/parallax-effect\/\">\u30102026\u5e74\u6700\u65b0\u3011\u30d1\u30e9\u30e9\u30c3\u30af\u30b9\u30b9\u30af\u30ed\u30fc\u30eb\u5b8c\u5168\u30ac\u30a4\u30c9\uff5cHTML\u30fbCSS\u3067\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u521d\u5fc3\u8005\u3067\u3082\u4f5c\u308c\u308b\u5b9f\u88c5\u65b9\u6cd5<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/pagination-design\/\">\u30102026\u5e74\u6700\u65b0\u3011\u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u5b9f\u88c5\u5b8c\u5168\u30ac\u30a4\u30c9\uff5cHTML\u30b3\u30d4\u30da\u3067\u5373\u4f7f\u3048\u308bCSS\u4ed8\u304d\u30c7\u30b6\u30a4\u30f3\u96c6<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/markuplint-complete-guide\/\">Markuplint\u5b8c\u5168\u30ac\u30a4\u30c9\uff5c\u5168\u30eb\u30fc\u30eb\u89e3\u8aac\u30fbReact\/Vue\/Astro\u5bfe\u5fdc\u30fbVSCode\u30fbpre-commit\u30fbGitHub Actions\u30fb\u30ab\u30b9\u30bf\u30e0\u30eb\u30fc\u30eb\u30fb\u6bb5\u968e\u7684\u5c0e\u5165\u6226\u7565\u307e\u3067\u5fb9\u5e95\u89e3\u8aac<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/wai-aria-complete-guide\/\">WAI-ARIA\u5b8c\u5168\u30ac\u30a4\u30c9\uff5caria-label\u30fbaria-live\u30fb\u30d5\u30a9\u30fc\u30ab\u30b9\u7ba1\u7406\u30fb\u30ad\u30fc\u30dc\u30fc\u30c9\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u30fbReact\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30fbaxe\u30c6\u30b9\u30c8\u307e\u3067\u5fb9\u5e95\u89e3\u8aac<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/link-decoration\/\">CSS\u3067\u30ea\u30f3\u30af\u4e0b\u7dda\u3092\u6d88\u3059\u65b9\u6cd5\uff5c\u8272\u30fb\u592a\u3055\u30fb\u5f62\u72b6\u3092\u5b8c\u5168\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/html-tags\/\">HTML\u30bf\u30b0\u4e00\u89a7\uff5c\u521d\u5fc3\u8005\u5411\u3051\u57fa\u672c26\u500b\u306e\u4f7f\u3044\u65b9\u5b8c\u5168\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/content-security-policy\/\">CSP\u5b8c\u5168\u30ac\u30a4\u30c9\uff5cXSS\u5bfe\u7b56\u304b\u3089\u6bb5\u968e\u7684\u5c0e\u5165\u307e\u3067\u30102026\u5e74\u7248\u3011<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<!-- withmedia-references -->\n<h2 class=\"wp-block-heading\">\u53c2\u8003\u30ea\u30f3\u30af\uff08\u516c\u5f0f\u30fb\u4e00\u6b21\u60c5\u5831\uff09<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTML\" target=\"_blank\" rel=\"noopener noreferrer\">MDN Web Docs \u2014 HTML<\/a><\/li>\n<li><a href=\"https:\/\/developers.google.com\/search\/docs\/fundamentals\/seo-starter-guide?hl=ja\" target=\"_blank\" rel=\"noopener noreferrer\">Google \u691c\u7d22\u30bb\u30f3\u30c8\u30e9\u30eb\uff08SEO\u30b9\u30bf\u30fc\u30bf\u30fc\u30ac\u30a4\u30c9\uff09<\/a><\/li>\n<li><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/CSS\" target=\"_blank\" rel=\"noopener noreferrer\">MDN Web Docs \u2014 CSS<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<!-- withmedia-faq -->\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Q1. HTML\u3067\u6587\u5b57\u8272\u3092\u5909\u3048\u308b&lt;font&gt;\u30bf\u30b0\u306f\u4eca\u3082\u4f7f\u3048\u307e\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> &lt;font&gt;\u30bf\u30b0\u306fHTML5\u4ee5\u964d\u3067\u306f\u975e\u63a8\u5968\u3067\u3059\u3002\u30c7\u30b6\u30a4\u30f3\u3068\u69cb\u9020\u304c\u6df7\u5728\u3057\u3066\u4fdd\u5b88\u6027\u304c\u4e0b\u304c\u308a\u3001\u8907\u6570\u7b87\u6240\u3078\u306e\u9069\u7528\u304c\u975e\u52b9\u7387\u3067\u3001\u4e92\u63db\u6027\u306e\u554f\u984c\u3082\u3042\u308a\u307e\u3059\u3002\u73fe\u5728\u306f&lt;font&gt;\u30bf\u30b0\u3067\u306f\u306a\u304f\u3001CSS\u306ecolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u30b9\u30bf\u30a4\u30eb\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q2. CSS\u3067\u6587\u5b57\u8272\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u306b\u306f\u3069\u3093\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> color\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3044\u3001\u8272\u540d\uff08red\u306a\u3069\uff09\u300116\u9032\u6570\u306e\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\uff08#ff0000\u306a\u3069\uff09\u3001RGB\u5024\uff08rgb(255,0,0)\u306a\u3069\uff09\u3001HSL\uff08\u8272\u76f8\u30fb\u5f69\u5ea6\u30fb\u660e\u5ea6\uff09\u3067\u6307\u5b9a\u3067\u304d\u307e\u3059\u300216\u9032\u6570\u3084RGB\u306f\u307b\u3068\u3093\u3069\u306e\u30e2\u30c0\u30f3\u30d6\u30e9\u30a6\u30b6\u3067\u5b89\u5b9a\u3057\u3066\u8868\u793a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q3. \u6587\u5b57\u8272\u3092\u9078\u3076\u3068\u304d\u306b\u6c17\u3092\u3064\u3051\u308b\u3079\u304d\u30c7\u30b6\u30a4\u30f3\u4e0a\u306e\u30dd\u30a4\u30f3\u30c8\u306f\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> \u80cc\u666f\u8272\u3068\u6587\u5b57\u8272\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306f4.5:1\u4ee5\u4e0a\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u3092\u7d71\u4e00\u3057\u3001\u8d64\u3068\u7dd1\u306e\u3088\u3046\u306b\u8272\u899a\u7570\u5e38\u306e\u65b9\u306b\u8b58\u5225\u3057\u3065\u3089\u3044\u7d44\u307f\u5408\u308f\u305b\u306f\u8272\u3060\u3051\u306b\u983c\u3089\u305a\u30a2\u30a4\u30b3\u30f3\u3084\u88c5\u98fe\u3092\u4f75\u7528\u3057\u307e\u3059\u3002\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3067\u898b\u3048\u65b9\u306e\u5909\u5316\u306b\u3082\u914d\u616e\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q4. \u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u3068\u5916\u90e8\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u306f\u3069\u3046\u4f7f\u3044\u5206\u3051\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> \u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u306fHTML\u30bf\u30b0\u5185\u306b\u76f4\u63a5\u8a18\u8ff0\u3059\u308b\u65b9\u6cd5\u3067\u3001\u7279\u5b9a\u306e\u8981\u7d20\u306b\u3059\u3050\u9069\u7528\u3067\u304d\u521d\u5fc3\u8005\u5411\u3051\u3067\u3059\u3002\u305f\u3060\u3057\u5927\u898f\u6a21\u30b5\u30a4\u30c8\u3067\u306f\u3001HTML\u3068CSS\u3092\u5206\u96e2\u3057\u3066\u5916\u90e8\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3067\u4e00\u5143\u7ba1\u7406\u3059\u308b\u65b9\u304c\u3001\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u52b9\u7387\u7684\u306a\u305f\u3081\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n\n<h2 class=\"wp-block-heading\">AI\u30b9\u30ad\u30eb\u3067\u3001\u672a\u6765\u306e\u81ea\u5206\u3092\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\uff01<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/s.lmes.jp\/landing-qr\/2010578884-C5To3Fmv?uLand=phzKXf\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" width=\"1254\" height=\"1254\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/withai-cta-banner.jpg\" alt=\"\u4eca\u306a\u3089\u5b8c\u5168\u7121\u6599\u3067AI\u3092\u5b66\u3079\u308b\uff01WithAI\" class=\"wp-image-18841\" style=\"max-width:600px;width:100%;height:auto\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/withai-cta-banner.jpg 1254w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/withai-cta-banner-768x768.jpg 768w\" sizes=\"(max-width: 1254px) 100vw, 1254px\" \/><\/a><\/figure>\n\n<h3 class=\"wp-block-heading\">\u4eca\u306a\u3089\u5b8c\u5168\u7121\u6599\u3067AI\u3092\u5b66\u3079\u308b\uff01<\/h3>\n\n<ul class=\"wp-block-list\">\n<li><strong>\u52d5\u753b\u3084\u5b9f\u8df5\u3067\u697d\u3057\u304f\u5b66\u3079\u308b<\/strong>\uff1a\u521d\u5fc3\u8005\u3067\u3082\u5b89\u5fc3\u306e\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0<\/li>\n<li><strong>\u30b9\u30de\u30db\u30fbPC\u3069\u3061\u3089\u3067\u3082OK<\/strong>\uff1a\u597d\u304d\u306a\u6642\u9593\u306b\u5b66\u7fd2\u3067\u304d\u308b<\/li>\n<li><strong>\u6599\u91d1\u306f\u4e00\u5207\u30ca\u30b7<\/strong>\uff1a<span class=\"swl-marker mark_yellow\">0\u5186\u3067AI\u30b9\u30ad\u30eb\u304c\u8eab\u306b\u3064\u304f<\/span><\/li>\n<\/ul>\n\n<p>\u76ee\u7684\u306b\u5408\u308f\u305b\u3066\u9078\u3079\u308b\u300cAI\u526f\u696d\u300d\u300cAI\u8ee2\u8077\u300d\u300cAI\u6d3b\u7528\u300d\u306e3\u30b3\u30fc\u30b9\u3092\u7528\u610f\u3002\u526f\u53ce\u5165\u30fb\u30ad\u30e3\u30ea\u30a2\u30c1\u30a7\u30f3\u30b8\u30fb\u65e5\u5e38\u306e\u751f\u7523\u6027\u30a2\u30c3\u30d7\u307e\u3067\u3001\u3042\u306a\u305f\u306e\u30b4\u30fc\u30eb\u306b\u5408\u308f\u305b\u3066AI\u3092\u5b66\u3079\u307e\u3059\u3002<\/p>\n\n<p>\u4f1a\u54e1\u767b\u9332\u306f\u30ab\u30f3\u30bf\u30f330\u79d2\u3067\u5b8c\u4e86\u3057\u307e\u3059\u3002\u307e\u305a\u306f\u516c\u5f0fLINE\u304b\u3089\u3001\u7121\u6599\u3067AI\u5b66\u7fd2\u3092\u30b9\u30bf\u30fc\u30c8\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n\n<div class=\"wp-block-buttons\"><div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/s.lmes.jp\/landing-qr\/2010578884-C5To3Fmv?uLand=phzKXf\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"background-color:#06c755\"><strong>\u516c\u5f0fLINE\u304b\u3089\u5b66\u7fd2\u3092\u30b9\u30bf\u30fc\u30c8<\/strong><\/a><\/div><\/div>\n\n\n<!-- withmedia-faq-schema -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"HTML\u3067\u6587\u5b57\u8272\u3092\u5909\u3048\u308b<font>\u30bf\u30b0\u306f\u4eca\u3082\u4f7f\u3048\u307e\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": 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