{"id":19314,"date":"2026-07-28T13:57:41","date_gmt":"2026-07-28T13:57:41","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=19314"},"modified":"2026-07-28T15:00:12","modified_gmt":"2026-07-28T15:00:12","slug":"main-visual-guide","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/main-visual-guide\/","title":{"rendered":"\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u306f\uff1f\u30b5\u30a4\u30ba\u30fb\u4f5c\u308a\u65b9\u30fb\u30c7\u30b6\u30a4\u30f3\u4f8b\u3092\u89e3\u8aac"},"content":{"rendered":"<p><!-- roam:retrofit18209 --><\/p>\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-left\" data-col=\"gray\">\n<div class=\"c-balloon__icon -square\"><img decoding=\"async\" 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>\n<div class=\"c-balloon__body -speaking -border-none\">\n<div class=\"c-balloon__text\">\n<p><strong>\u300c\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u300d\u3063\u3066\u3088\u304f\u805e\u304d\u307e\u3059\u304c\u3001\u30d2\u30fc\u30ed\u30fc\u753b\u50cf\u3068\u4f55\u304c\u9055\u3046\u3093\u3067\u3059\u304b\uff1f\u30b5\u30a4\u30ba\u3082\u8ff7\u3044\u307e\u3059\u2026<\/strong><\/p>\n<p><span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-right\" data-col=\"gray\">\n<div class=\"c-balloon__icon -square\"><img decoding=\"async\" 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 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class=\"wp-block-paragraph\">Web\u30b5\u30a4\u30c8\u3092\u958b\u3044\u305f\u77ac\u9593\u3001\u8a2a\u554f\u8005\u306e\u76ee\u306b\u6700\u521d\u306b\u98db\u3073\u8fbc\u3093\u3067\u304f\u308b\u5927\u304d\u306a\u30d3\u30b8\u30e5\u30a2\u30eb\u9818\u57df\u2014\u2014\u305d\u308c\u304c<strong><span class=\"swl-marker 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class=\"wp-block-list\">\n<li>\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u30fb\u30d2\u30fc\u30ed\u30fc\u30a4\u30e1\u30fc\u30b8\u30fb\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u306e\u9055\u3044<\/li>\n<li>PC\u30fb\u30bf\u30d6\u30ec\u30c3\u30c8\u30fb\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u5225\u306e\u63a8\u5968\u30b5\u30a4\u30ba\u3068\u89e3\u50cf\u5ea6<\/li>\n<li>Retina\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u5bfe\u5fdc\u3068\u753b\u50cf\u6700\u9069\u5316\uff08WebP\u30fb\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff09\u306e\u65b9\u6cd5<\/li>\n<li>\u30c6\u30ad\u30b9\u30c8\u30b3\u30d4\u30fc\u3068CTA\u30dc\u30bf\u30f3\u306e\u52b9\u679c\u7684\u306a\u914d\u7f6e<\/li>\n<li>HTML\/CSS\u3067\u5168\u9762\u80cc\u666f\u8868\u793a\u3092\u5b9f\u88c5\u3059\u308b\u30b3\u30fc\u30c9<\/li>\n<li>\u3088\u304f\u3042\u308b\u5931\u6557\u3068\u305d\u306e\u89e3\u6c7a\u7b56<\/li>\n<\/ul>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u306f\u4f55\u304b<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19314-1\"><img decoding=\"async\" width=\"1568\" height=\"949\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-1.png\" alt=\"\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u5f79\u5272\" class=\"wp-image-19415\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-1.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-1-768x465.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-1-1536x930.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\uff08Main Visual\uff09\u3068\u306f\u3001Web\u30da\u30fc\u30b8\u306e\u30c8\u30c3\u30d7\u90e8\u5206\u306b\u914d\u7f6e\u3055\u308c\u308b\u6700\u3082\u5927\u304d\u306a\u30d3\u30b8\u30e5\u30a2\u30eb\u8981\u7d20\u306e\u3053\u3068\u3067\u3059\u3002\u82f1\u8a9e\u3067\u306f\u300cHero Image\u300d\u300cHero Section\u300d\u3068\u547c\u3070\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u5199\u771f\u30fb\u30a4\u30e9\u30b9\u30c8\u30fb\u52d5\u753b\u30fb\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306a\u3069\u3092\u80cc\u666f\u306b\u30d6\u30e9\u30f3\u30c9\u30e1\u30c3\u30bb\u30fc\u30b8\u3084CTA\u30dc\u30bf\u30f3\u3092\u91cd\u306d\u308b\u69cb\u6210\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<p class=\"wp-block-paragraph\">Web\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u969b\u306b\u6700\u521d\u306b\u76ee\u306b\u5165\u308b\u30a8\u30ea\u30a2\u3067\u3042\u308b\u305f\u3081\u3001\u30d6\u30e9\u30f3\u30c9\u306e\u4e16\u754c\u89b3\u30fb\u4fe1\u983c\u611f\u30fb\u30b5\u30fc\u30d3\u30b9\u306e\u9b45\u529b\u3092\u77ac\u6642\u306b\u4f1d\u3048\u308b\u5f79\u5272\u3092\u62c5\u3063\u3066\u3044\u307e\u3059\u3002\u8a2a\u554f\u8005\u304c\u300c\u3053\u306e\u30b5\u30a4\u30c8\u3092\u8aad\u307f\u7d9a\u3051\u308b\u304b\u96e2\u8131\u3059\u308b\u304b\u300d\u3092\u6c7a\u3081\u308b\u6570\u79d2\u9593\u306e\u52dd\u8ca0\u3069\u3053\u308d\u3068\u3082\u3044\u3048\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u30d2\u30fc\u30ed\u30fc\u30a4\u30e1\u30fc\u30b8\u3068\u306e\u9055\u3044<\/h3>\n<p class=\"wp-block-paragraph\">\u300c\u30d2\u30fc\u30ed\u30fc\u30a4\u30e1\u30fc\u30b8\uff08Hero Image\uff09\u300d\u306f\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u307b\u307c\u540c\u7fa9\u3067\u4f7f\u308f\u308c\u308b\u3053\u3068\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002\u305f\u3060\u3057\u53b3\u5bc6\u306b\u306f\u3001\u30d2\u30fc\u30ed\u30fc\u30a4\u30e1\u30fc\u30b8\u306f<strong><span class=\"swl-marker mark_yellow\">\u80cc\u666f\u306b\u4f7f\u7528\u3059\u308b\u5927\u304d\u306a\u753b\u50cf\u305d\u306e\u3082\u306e<\/span><\/strong>\u3092\u6307\u3057\u3001\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306f\u305d\u306e\u753b\u50cf\u3092\u542b\u3080\u30bb\u30af\u30b7\u30e7\u30f3\u5168\u4f53\uff08\u30c6\u30ad\u30b9\u30c8\u30fb\u30dc\u30bf\u30f3\u8fbc\u307f\uff09\u3092\u6307\u3059\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u65e5\u672c\u8a9e\u306eWeb\u5236\u4f5c\u73fe\u5834\u3067\u306f\u300c\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\uff1d\u30d2\u30fc\u30ed\u30fc\u30bb\u30af\u30b7\u30e7\u30f3\u300d\u3068\u3044\u3046\u610f\u5473\u5408\u3044\u3067\u4f7f\u308f\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u3068\u306e\u9055\u3044<\/h3>\n<p class=\"wp-block-paragraph\">\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\uff08First View\uff09\u3068\u306f\u3001<strong><span 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class=\"wp-block-heading\">\u30ad\u30fc\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u306e\u9055\u3044<\/h3>\n<p class=\"wp-block-paragraph\">\u30ad\u30fc\u30d3\u30b8\u30e5\u30a2\u30eb\uff08Key Visual\u3001KV\uff09\u306f\u3082\u3068\u3082\u3068\u5e83\u544a\u30fb\u5370\u5237\u7269\u306e\u4e16\u754c\u3067\u4f7f\u308f\u308c\u3066\u304d\u305f\u7528\u8a9e\u3067\u3001\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u5168\u4f53\u3092\u8c61\u5fb4\u3059\u308b\u6838\u3068\u306a\u308b\u30d3\u30b8\u30e5\u30a2\u30eb\u3092\u610f\u5473\u3057\u307e\u3059\u3002Web\u306e\u6587\u8108\u3067\u3082\u30c8\u30c3\u30d7\u30da\u30fc\u30b8\u306e\u5927\u304d\u306a\u30d3\u30b8\u30e5\u30a2\u30eb\u3092\u30ad\u30fc\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u547c\u3076\u30b1\u30fc\u30b9\u304c\u3042\u308a\u3001\u5b9f\u8cea\u7684\u306b\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u540c\u7fa9\u3067\u3059\u3002LP\uff08\u30e9\u30f3\u30c7\u30a3\u30f3\u30b0\u30da\u30fc\u30b8\uff09\u3067\u306f\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u306e\u753b\u50cf\u3092\u30ad\u30fc\u30d3\u30b8\u30e5\u30a2\u30eb\u3068\u547c\u3076\u3053\u3068\u304c\u7279\u306b\u591a\u3044\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u63a8\u5968\u30b5\u30a4\u30ba\u3068\u89e3\u50cf\u5ea6<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19314-2\"><img decoding=\"async\" width=\"1568\" height=\"669\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-2.png\" alt=\"\u30b5\u30a4\u30ba\u306e\u76ee\u5b89\" class=\"wp-image-19416\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-2.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-2-768x328.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-2-1536x655.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u30b5\u30a4\u30ba\u8a2d\u8a08\u3067\u6700\u3082\u91cd\u8981\u306a\u306e\u306f\u3001\u300c\u3069\u306e\u30c7\u30d0\u30a4\u30b9\u3067\u3069\u3046\u898b\u3048\u308b\u304b\u300d\u3092\u8d77\u70b9\u306b\u8003\u3048\u308b\u3053\u3068\u3067\u3059\u3002PC\u30fb\u30bf\u30d6\u30ec\u30c3\u30c8\u30fb\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u305d\u308c\u305e\u308c\u306e\u6a19\u6e96\u7684\u306a\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u30b5\u30a4\u30ba\u3092\u628a\u63e1\u3057\u305f\u3046\u3048\u3067\u3001\u753b\u50cf\u306e\u5b9f\u5bf8\u30fb\u89e3\u50cf\u5ea6\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">PC\u306e\u63a8\u5968\u30b5\u30a4\u30ba<\/h3>\n<p class=\"wp-block-paragraph\">\u73fe\u5728\u306e\u4e3b\u6d41\u30e2\u30cb\u30bf\u30fc\u30b5\u30a4\u30ba\u306f1280px\u301c1920px\u5e45\u3067\u3059\u3002\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u753b\u50cf\u306f<strong><span class=\"swl-marker mark_yellow\">\u5e451920px\u30fb\u9ad8\u30551080px\uff0816:9\uff09<\/span><\/strong>\u3092\u57fa\u6e96\u306b\u7528\u610f\u3057\u3066\u304a\u304f\u3068\u3001\u30d5\u30ebHD\u30e2\u30cb\u30bf\u30fc\u3067\u3082\u753b\u8cea\u304c\u843d\u3061\u307e\u305b\u3093\u3002\u305f\u3060\u3057\u5b9f\u969b\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u5e45\uff08\u30b3\u30f3\u30c6\u30ca\u5e45\uff09\u306f1000px\u301c1200px\u7a0b\u5ea6\u306b\u5236\u9650\u3059\u308b\u30b5\u30a4\u30c8\u304c\u591a\u3044\u305f\u3081\u3001\u80cc\u666f\u5168\u9762\u306b\u753b\u50cf\u3092\u6577\u304f\u5834\u5408\u306f1920px\u3001\u30b3\u30f3\u30c6\u30ca\u5185\u306b\u53ce\u3081\u308b\u5834\u5408\u306f1200px\u5e45\u3067\u7528\u610f\u3059\u308c\u3070\u5341\u5206\u3067\u3059\u3002<\/p>\n<ul class=\"wp-block-list\">\n<li>\u30d5\u30eb\u30b9\u30af\u30ea\u30fc\u30f3\u80cc\u666f\uff1a\u5e451920px \u00d7 \u9ad8\u30551080px<\/li>\n<li>\u30b3\u30f3\u30c6\u30ca\u5e45\u306b\u53ce\u3081\u308b\u5834\u5408\uff1a\u5e451200px \u00d7 \u9ad8\u3055675px\uff0816:9\uff09\u307e\u305f\u306f\u4efb\u610f\u306e\u9ad8\u3055<\/li>\n<li>\u89e3\u50cf\u5ea6\uff1a72dpi\uff08Web\u6a19\u6e96\uff09\u3001Retina\u5bfe\u5fdc\u306f2x\u753b\u50cf\uff083840\u00d72160\uff09\u3082\u7528\u610f<\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">\u30bf\u30d6\u30ec\u30c3\u30c8\u306e\u63a8\u5968\u30b5\u30a4\u30ba<\/h3>\n<p class=\"wp-block-paragraph\">\u30bf\u30d6\u30ec\u30c3\u30c8\uff08iPad\u7b49\uff09\u306e\u4ee3\u8868\u7684\u306a\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306f768px\u301c1024px\u5e45\u3067\u3059\u3002CSS\u5074\u3067\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u8a2d\u5b9a\u3057\u3001PC\u3068\u540c\u3058\u753b\u50cf\u3092\u4f7f\u3044\u306a\u304c\u3089\u9ad8\u3055\u3084\u8868\u793a\u4f4d\u7f6e\u3092\u8abf\u6574\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u5c02\u7528\u306e\u30bf\u30d6\u30ec\u30c3\u30c8\u753b\u50cf\u3092\u7528\u610f\u3059\u308b\u5834\u5408\u306f<strong><span class=\"swl-marker mark_yellow\">\u5e451024px \u00d7 \u9ad8\u3055768px<\/span><\/strong>\u304c\u57fa\u6e96\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306e\u63a8\u5968\u30b5\u30a4\u30ba<\/h3>\n<p class=\"wp-block-paragraph\">\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306f375px\u301c430px\u5e45\u304c\u4e3b\u6d41\u3067\u3059\u3002PC\u5411\u3051\u306e\u6a2a\u9577\u753b\u50cf\u3092\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3067\u305d\u306e\u307e\u307e\u4f7f\u3046\u3068\u3001\u4eba\u7269\u3084\u5546\u54c1\u304c\u5c0f\u3055\u304f\u898b\u3048\u305f\u308a\u3001\u91cd\u8981\u306a\u88ab\u5199\u4f53\u304c\u5207\u308c\u305f\u308a\u3059\u308b\u554f\u984c\u304c\u8d77\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081<strong><span class=\"swl-marker mark_yellow\">\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u5c02\u7528\u306e\u7e26\u9577\u753b\u50cf\uff08\u5e45750px \u00d7 \u9ad8\u30551000px\u301c1334px\u7a0b\u5ea6\uff09<\/span><\/strong>\u3092\u5225\u9014\u7528\u610f\u3059\u308b\u3053\u3068\u3092\u5f37\u304f\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">Retina\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u3078\u306e\u5bfe\u5fdc<\/h3>\n<p class=\"wp-block-paragraph\">Apple\u88fd\u54c1\u3092\u306f\u3058\u3081\u3068\u3059\u308bRetina\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\uff08\u9ad8DPI\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\uff09\u306f\u3001\u30c7\u30d0\u30a4\u30b9\u30d4\u30af\u30bb\u30eb\u6bd4\uff08DPR\uff09\u304c2\u500d\u307e\u305f\u306f3\u500d\u306b\u306a\u308a\u307e\u3059\u3002CSS\u30d4\u30af\u30bb\u30eb\u30671920px\u5e45\u306e\u30a8\u30ea\u30a2\u306b1920px\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u3068\u3001Retina\u3067\u306f\u5f15\u304d\u4f38\u3070\u3055\u308c\u3066\u307c\u3084\u3051\u3066\u898b\u3048\u307e\u3059\u3002\u5bfe\u51e6\u6cd5\u306f2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol class=\"wp-block-list\">\n<li><strong>2\u500d\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u7528\u610f\u3057\u3066max-width\u3067\u5236\u5fa1<\/strong>\uff1a3840px\u5e45\u306e\u753b\u50cf\u3092CSS\u30671920px\u306b\u53ce\u3081\u308b<\/li>\n<li><strong>srcset\u5c5e\u6027\u3067DPR\u5225\u306b\u753b\u50cf\u3092\u5207\u308a\u66ff\u3048<\/strong>\uff1a1x\u7528\u30682x\u7528\u3092\u7528\u610f\u3057\u3066\u30d6\u30e9\u30a6\u30b6\u306b\u9078\u629e\u3055\u305b\u308b<\/li>\n<\/ol>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- srcset\u3092\u4f7f\u3063\u305fRetina\u5bfe\u5fdc --&gt;\n&lt;img\n  src=\"hero-1920.jpg\"\n  srcset=\"hero-1920.jpg 1x, hero-3840.jpg 2x\"\n  alt=\"\u30d6\u30e9\u30f3\u30c9\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\"\n  width=\"1920\"\n  height=\"1080\"\n&gt;<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u753b\u50cf\u6700\u9069\u5316\u306e\u65b9\u6cd5<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19314-3\"><img decoding=\"async\" width=\"1568\" height=\"731\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-3.png\" alt=\"\u6700\u9069\u5316\u306e4\u30b9\u30c6\u30c3\u30d7\" class=\"wp-image-19417\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-3.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-3-768x358.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-3-1536x716.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306f\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044\u305f\u3081\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002Core Web Vitals\u306e\u6307\u6a19\u3067\u3042\u308bLCP\uff08Largest Contentful Paint\uff09\u306b\u6700\u3082\u5f71\u97ff\u3059\u308b\u8981\u7d20\u3067\u3082\u3042\u308b\u305f\u3081\u3001\u753b\u50cf\u6700\u9069\u5316\u306f\u5fc5\u9808\u3067\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">WebP\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3078\u306e\u5909\u63db<\/h3>\n<p class=\"wp-block-paragraph\">WebP\u306fGoogle\u304c\u958b\u767a\u3057\u305f\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3001\u540c\u7b49\u306e\u753b\u8cea\u3067JPEG\u3088\u308a25\u301c35%\u3001PNG\u3088\u308a\u6700\u592780%\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3067\u304d\u307e\u3059\u3002\u73fe\u5728\u306f\u307b\u307c\u3059\u3079\u3066\u306e\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u304cWebP\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3059\u3079\u304d\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- picture\u30bf\u30b0\u3067WebP\u5bfe\u5fdc\u3068\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u4e21\u7acb --&gt;\n&lt;picture&gt;\n  &lt;source\n    srcset=\"hero.webp 1x, hero@2x.webp 2x\"\n    type=\"image\/webp\"\n  &gt;\n  &lt;img\n    src=\"hero.jpg\"\n    srcset=\"hero.jpg 1x, hero@2x.jpg 2x\"\n    alt=\"\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\"\n    width=\"1920\"\n    height=\"1080\"\n    fetchpriority=\"high\"\n  &gt;\n&lt;\/picture&gt;<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff08Lazy Load\uff09\u306e\u6ce8\u610f\u70b9<\/h3>\n<p class=\"wp-block-paragraph\">\u753b\u50cf\u306e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff08loading=&#8221;lazy&#8221;\uff09\u306f\u30b9\u30af\u30ed\u30fc\u30eb\u5f8c\u306b\u8868\u793a\u3055\u308c\u308b\u753b\u50cf\u306b\u306f\u6709\u52b9\u3067\u3059\u304c\u3001<strong><span class=\"swl-marker mark_yellow\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306b\u306f\u7d76\u5bfe\u306bloading=&#8221;lazy&#8221;\u3092\u8a2d\u5b9a\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093<\/span><\/strong>\u3002\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc\u306b\u8868\u793a\u3055\u308c\u308b\u6700\u91cd\u8981\u753b\u50cf\u3092\u9045\u5ef6\u3055\u305b\u308b\u3068LCP\u30b9\u30b3\u30a2\u304c\u5927\u5e45\u306b\u60aa\u5316\u3057\u307e\u3059\u3002\u4ee3\u308f\u308a\u306b`fetchpriority=&#8221;high&#8221;`\u3092\u8a2d\u5b9a\u3057\u3066\u512a\u5148\u8aad\u307f\u8fbc\u307f\u3092\u6307\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- \u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306flazy\u3092\u4f7f\u308f\u305a\u512a\u5148\u8aad\u307f\u8fbc\u307f\u306b\u3059\u308b --&gt;\n&lt;img\n  src=\"hero.webp\"\n  alt=\"\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\"\n  width=\"1920\"\n  height=\"1080\"\n  fetchpriority=\"high\"\n  decoding=\"async\"\n&gt;\n&lt;!-- \u30b9\u30af\u30ed\u30fc\u30eb\u5f8c\u306e\u753b\u50cf\u306b\u306flazy\u3092\u4f7f\u3046 --&gt;\n&lt;img\n  src=\"product.webp\"\n  alt=\"\u5546\u54c1\u30a4\u30e1\u30fc\u30b8\"\n  width=\"800\"\n  height=\"600\"\n  loading=\"lazy\"\n  decoding=\"async\"\n&gt;<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">preload\u30ea\u30f3\u30af\u30bf\u30b0\u306b\u3088\u308b\u5148\u8aad\u307f<\/h3>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306eLCP\u3092\u3055\u3089\u306b\u6539\u5584\u3059\u308b\u306b\u306f\u3001`&lt;head&gt;`\u5185\u3067preload\u3092\u8a2d\u5b9a\u3057\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u65e9\u671f\u306b\u753b\u50cf\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u958b\u59cb\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- head\u30bf\u30b0\u5185\u306b\u8ffd\u52a0 --&gt;\n&lt;link\n  rel=\"preload\"\n  as=\"image\"\n  href=\"hero.webp\"\n  imagesrcset=\"hero-750.webp 750w, hero-1920.webp 1920w\"\n  imagesizes=\"100vw\"\n&gt;<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u30c7\u30b6\u30a4\u30f3\u4f8b\u3068\u4f5c\u308a\u65b9<\/h2>\n<p class=\"wp-block-paragraph\">\u52b9\u679c\u7684\u306a\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306f\u300c\u5199\u771f\u30fb\u30b3\u30d4\u30fc\u30fbCTA\u300d\u306e3\u8981\u7d20\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u6210\u7acb\u3057\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u8a2d\u8a08\u30dd\u30a4\u30f3\u30c8\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u4e3b\u306a\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3<\/h3>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u30c7\u30b6\u30a4\u30f3\u306b\u306f\u5927\u304d\u304f\u5206\u3051\u3066\u4ee5\u4e0b\u306e\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30d1\u30bf\u30fc\u30f3<\/th>\n<th>\u7279\u5fb4<\/th>\n<th>\u5411\u3044\u3066\u3044\u308b\u30b5\u30a4\u30c8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u30d5\u30eb\u30b9\u30af\u30ea\u30fc\u30f3\u80cc\u666f\u753b\u50cf<\/td>\n<td>\u8feb\u529b\u30fb\u6ca1\u5165\u611f\u304c\u9ad8\u3044<\/td>\n<td>\u30d6\u30e9\u30f3\u30c9\u30b5\u30a4\u30c8\u30fb\u89b3\u5149\u30fb\u98f2\u98df<\/td>\n<\/tr>\n<tr>\n<td>\u5de6\u30c6\u30ad\u30b9\u30c8\uff0b\u53f3\u753b\u50cf\uff08\u534a\u5272\uff09<\/td>\n<td>\u60c5\u5831\u304c\u6574\u7406\u3055\u308c\u3066\u8aad\u307f\u3084\u3059\u3044<\/td>\n<td>SaaS\u30fb\u30b3\u30fc\u30dd\u30ec\u30fc\u30c8<\/td>\n<\/tr>\n<tr>\n<td>\u30b9\u30e9\u30a4\u30c0\u30fc\uff08\u30ab\u30eb\u30fc\u30bb\u30eb\uff09<\/td>\n<td>\u8907\u6570\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8a34\u6c42\u3067\u304d\u308b<\/td>\n<td>EC\u30b5\u30a4\u30c8\u30fb\u30e1\u30c7\u30a3\u30a2<\/td>\n<\/tr>\n<tr>\n<td>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff0b\u30c6\u30ad\u30b9\u30c8<\/td>\n<td>\u8efd\u91cf\u30fb\u30e2\u30c0\u30f3<\/td>\n<td>\u30b9\u30bf\u30fc\u30c8\u30a2\u30c3\u30d7\u30fb\u30a2\u30d7\u30ea<\/td>\n<\/tr>\n<tr>\n<td>\u80cc\u666f\u52d5\u753b<\/td>\n<td>\u30a4\u30f3\u30d1\u30af\u30c8\u5927\u30fb\u4e16\u754c\u89b3\u3092\u4f1d\u3048\u308b<\/td>\n<td>\u30e9\u30b0\u30b8\u30e5\u30a2\u30ea\u30fc\u30fb\u30af\u30ea\u30a8\u30a4\u30c6\u30a3\u30d6\u7cfb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 class=\"wp-block-heading\">\u30b3\u30d4\u30fc\u30e9\u30a4\u30c6\u30a3\u30f3\u30b0\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306b\u8f09\u305b\u308b\u30ad\u30e3\u30c3\u30c1\u30b3\u30d4\u30fc\u306f<strong><span class=\"swl-marker mark_yellow\">\u300c\u8ab0\u306e\u30fb\u4f55\u306e\u30fb\u3069\u3093\u306a\u4fa1\u5024\u304b\u300d\u3092\u4e00\u77ac\u3067\u4f1d\u3048\u308b<\/span><\/strong>\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u9577\u3044\u6587\u7ae0\u306f\u8aad\u307e\u308c\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306e\u30d5\u30a9\u30fc\u30df\u30e5\u30e9\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>\u4fa1\u5024\u63d0\u6848\u578b<\/strong>\uff1a\u300c\u3007\u3007\u304c\u3001\u3082\u3063\u3068\u7c21\u5358\u306b\u3002\u300d<\/li>\n<li><strong>\u8ab2\u984c\u89e3\u6c7a\u578b<\/strong>\uff1a\u300c\u3007\u3007\u3067\u60a9\u3093\u3067\u3044\u307e\u305b\u3093\u304b\uff1f\u300d<\/li>\n<li><strong>\u6570\u5b57\u8a34\u6c42\u578b<\/strong>\uff1a\u300c\u5c0e\u5165\u4f01\u696d3,000\u793e\u7a81\u7834\u300d<\/li>\n<li><strong>\u30d9\u30cd\u30d5\u30a3\u30c3\u30c8\u578b<\/strong>\uff1a\u300c\u660e\u65e5\u304b\u3089\u4f7f\u3048\u308b\u3007\u3007\u300d<\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">CTA\u30dc\u30bf\u30f3\u306e\u914d\u7f6e<\/h3>\n<p class=\"wp-block-paragraph\">CTA\u30dc\u30bf\u30f3\u306f\u30b3\u30d4\u30fc\u306e\u76f4\u4e0b\u306b\u914d\u7f6e\u3057\u3001\u80cc\u666f\u3068\u306e\u5341\u5206\u306a\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\uff08WCAG AA\u3067\u306f4.5:1\u4ee5\u4e0a\uff09\u3092\u78ba\u4fdd\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30dc\u30bf\u30f3\u306e\u5927\u304d\u3055\u306f\u6700\u4f4e\u3067\u3082\u30bf\u30c3\u30d7\u30a8\u30ea\u30a2\u3068\u3057\u306648px \u00d7 48px\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u4fc3\u3059\u30c6\u30ad\u30b9\u30c8\u306f\u300c\u8a73\u3057\u304f\u898b\u308b\u300d\u3088\u308a\u300c\u7121\u6599\u3067\u8a66\u3059\u300d\u300c\u8cc7\u6599\u3092\u4eca\u3059\u3050\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u300d\u306a\u3069\u5177\u4f53\u7684\u306a\u884c\u52d5\u3092\u793a\u3059\u8a00\u8449\u304c\u52b9\u679c\u7684\u3067\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">HTML\/CSS\u3067\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3092\u5b9f\u88c5\u3059\u308b<\/h2>\n<p class=\"wp-block-paragraph\">\u3053\u3053\u304b\u3089\u306f\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u3001\u4ee3\u8868\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002\u80cc\u666f\u753b\u50cf\u3092CSS\u3067\u5168\u9762\u8868\u793a\u3059\u308b\u65b9\u6cd5\u3068\u3001img\u30bf\u30b0\u3092\u4f7f\u3063\u305f\u65b9\u6cd5\u306e\u4e21\u65b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">background-size\u3092\u4f7f\u3063\u305f\u80cc\u666f\u5168\u9762\u8868\u793a<\/h3>\n<p class=\"wp-block-paragraph\">CSS\u306e`background-size: cover`\u3092\u4f7f\u3046\u65b9\u6cd5\u306f\u6700\u3082\u624b\u8efd\u3067\u3059\u3002\u30b3\u30f3\u30c6\u30ca\u306e\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u306b\u5408\u308f\u305b\u3066\u753b\u50cf\u304c\u81ea\u52d5\u7684\u306b\u62e1\u7e2e\u30fb\u30af\u30ed\u30c3\u30d7\u3055\u308c\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;section class=\"hero\"&gt;\n  &lt;div class=\"hero__inner\"&gt;\n    &lt;h1 class=\"hero__title\"&gt;\u3042\u306a\u305f\u306e\u30d3\u30b8\u30cd\u30b9\u3092\u3001\u6b21\u306e\u30b9\u30c6\u30fc\u30b8\u3078&lt;\/h1&gt;\n    &lt;p class=\"hero__lead\"&gt;Web\u5236\u4f5c\u30fb\u30b7\u30b9\u30c6\u30e0\u958b\u767a\u306e\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u30c1\u30fc\u30e0&lt;\/p&gt;\n    &lt;a href=\"\/contact\/\" class=\"hero__cta\"&gt;\u7121\u6599\u3067\u76f8\u8ac7\u3059\u308b&lt;\/a&gt;\n  &lt;\/div&gt;\n&lt;\/section&gt;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.hero {\n  \/* \u80cc\u666f\u753b\u50cf\u306e\u5168\u9762\u8868\u793a\u8a2d\u5b9a *\/\n  background-image: url('hero.webp');\n  background-size: cover;\n  background-position: center center;\n  background-repeat: no-repeat;\n\n  \/* \u9ad8\u3055\u306e\u8a2d\u5b9a *\/\n  min-height: 100vh;\n  \/* \u30e2\u30c0\u30f3\u30d6\u30e9\u30a6\u30b6\u306fdvh\u3092\u4f7f\u3046\u3068\u6b63\u78ba *\/\n  min-height: 100dvh;\n\n  \/* \u30d5\u30ec\u30c3\u30af\u30b9\u3067\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u4e2d\u592e\u914d\u7f6e *\/\n  display: flex;\n  align-items: center;\n  justify-content: center;\n\n  \/* \u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\uff08\u6697\u5e55\uff09\u3067\u6587\u5b57\u3092\u898b\u3084\u3059\u304f *\/\n  position: relative;\n}\n\n.hero::before {\n  content: '';\n  position: absolute;\n  inset: 0;\n  background: rgba(0, 0, 0, 0.45);\n}\n\n.hero__inner {\n  position: relative;\n  z-index: 1;\n  text-align: center;\n  color: #fff;\n  padding: 0 1.5rem;\n  max-width: 800px;\n}\n\n.hero__title {\n  font-size: clamp(1.8rem, 4vw, 3.5rem);\n  font-weight: 700;\n  line-height: 1.3;\n  margin-bottom: 1rem;\n}\n\n.hero__lead {\n  font-size: clamp(1rem, 2vw, 1.3rem);\n  margin-bottom: 2rem;\n  opacity: 0.9;\n}\n\n.hero__cta {\n  display: inline-block;\n  padding: 1rem 2.5rem;\n  background-color: #d16176;\n  color: #fff;\n  text-decoration: none;\n  border-radius: 4px;\n  font-size: 1.1rem;\n  font-weight: 700;\n  transition: background-color 0.2s;\n}\n\n.hero__cta:hover {\n  background-color: #b84d61;\n}\n\n\/* \u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u5bfe\u5fdc *\/\n@media (max-width: 640px) {\n  .hero {\n    background-image: url('hero-sp.webp');\n    background-position: top center;\n  }\n}<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">object-fit\u3092\u4f7f\u3063\u305fimg\u30bf\u30b0\u306b\u3088\u308b\u5b9f\u88c5<\/h3>\n<p class=\"wp-block-paragraph\">img\u30bf\u30b0\u3092\u4f7f\u3046\u65b9\u6cd5\u306fLCP\u306e\u6700\u9069\u5316\u30fbSEO\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306e\u9762\u3067CSS\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3088\u308a\u6709\u5229\u3067\u3059\u3002`object-fit: cover`\u3067\u30b3\u30f3\u30c6\u30ca\u306b\u5408\u308f\u305b\u3066\u30af\u30ed\u30c3\u30d7\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;section class=\"hero\"&gt;\n  &lt;picture class=\"hero__bg\"&gt;\n    &lt;source\n      media=\"(max-width: 640px)\"\n      srcset=\"hero-sp.webp 750w\"\n      type=\"image\/webp\"\n    &gt;\n    &lt;source\n      srcset=\"hero-1920.webp 1920w, hero-1280.webp 1280w\"\n      sizes=\"100vw\"\n      type=\"image\/webp\"\n    &gt;\n    &lt;img\n      src=\"hero-1920.jpg\"\n      alt=\"\"\n      width=\"1920\"\n      height=\"1080\"\n      fetchpriority=\"high\"\n      decoding=\"async\"\n    &gt;\n  &lt;\/picture&gt;\n  &lt;div class=\"hero__inner\"&gt;\n    &lt;h1 class=\"hero__title\"&gt;\u3042\u306a\u305f\u306e\u30d3\u30b8\u30cd\u30b9\u3092\u3001\u6b21\u306e\u30b9\u30c6\u30fc\u30b8\u3078&lt;\/h1&gt;\n    &lt;a href=\"\/contact\/\" class=\"hero__cta\"&gt;\u7121\u6599\u3067\u76f8\u8ac7\u3059\u308b&lt;\/a&gt;\n  &lt;\/div&gt;\n&lt;\/section&gt;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.hero {\n  position: relative;\n  min-height: 100vh;\n  min-height: 100dvh;\n  display: flex;\n  align-items: center;\n  justify-content: center;\n  overflow: hidden;\n}\n\n.hero__bg {\n  position: absolute;\n  inset: 0;\n  width: 100%;\n  height: 100%;\n}\n\n.hero__bg img {\n  width: 100%;\n  height: 100%;\n  object-fit: cover;\n  object-position: center center;\n}\n\n\/* \u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\u3092img\u306e\u4e0a\u306b\u91cd\u306d\u308b *\/\n.hero__bg::after {\n  content: '';\n  position: absolute;\n  inset: 0;\n  background: rgba(0, 0, 0, 0.4);\n}\n\n.hero__inner {\n  position: relative;\n  z-index: 1;\n  text-align: center;\n  color: #fff;\n  padding: 0 1.5rem;\n}<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u306e\u9ad8\u3055\u8a2d\u5b9a<\/h3>\n<p class=\"wp-block-paragraph\">\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3067\u306f100vh\u304c\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u306e\u9ad8\u3055\u3092\u542b\u3093\u3067\u3057\u307e\u3044\u3001\u610f\u56f3\u3057\u305f\u8868\u793a\u306b\u306a\u3089\u306a\u3044\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002\u30e2\u30c0\u30f3\u30d6\u30e9\u30a6\u30b6\u3067\u306f`100dvh`\uff08dynamic viewport height\uff09\u3092\u4f7f\u3046\u3053\u3068\u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3078\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3082\u5fd8\u308c\u305a\u306b\u8a2d\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.hero {\n  \/* \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af *\/\n  min-height: 100vh;\n  \/* \u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u3067\u306fdvh\u3067\u4e0a\u66f8\u304d *\/\n  min-height: 100dvh;\n}\n\n\/* \u30bf\u30d6\u30ec\u30c3\u30c8\uff1a\u5c11\u3057\u4f4e\u3081\u306b\u8a2d\u5b9a *\/\n@media (max-width: 1024px) {\n  .hero {\n    min-height: 80vh;\n    min-height: 80dvh;\n  }\n}\n\n\/* \u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\uff1a\u7e26\u6a2a\u6bd4\u3067\u5236\u5fa1\u3059\u308b\u3053\u3068\u3082\u3042\u308b *\/\n@media (max-width: 640px) {\n  .hero {\n    \/* \u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3067\u9ad8\u3055\u3092\u6c7a\u3081\u308b\u624b\u6cd5 *\/\n    aspect-ratio: 3 \/ 4;\n    min-height: unset;\n  }\n}<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u5931\u6557\u3068\u89e3\u6c7a\u7b56<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19314-4\"><img decoding=\"async\" width=\"1568\" height=\"669\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-4.png\" alt=\"\u3064\u307e\u305a\u304d\u2192\u5bfe\u51e6\" class=\"wp-image-19418\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-4.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-4-768x328.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19314-4-1536x655.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u5b9f\u88c5\u3067\u3064\u307e\u305a\u304d\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u3092\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u5931\u65571\uff1a\u753b\u50cf\u304c\u91cd\u304f\u3066\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u304c\u9045\u3044<\/h3>\n<p class=\"wp-block-paragraph\">\u539f\u56e0\u306f\u753b\u50cf\u3092\u6700\u9069\u5316\u305b\u305a\u306b\u305d\u306e\u307e\u307e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002Photoshop\u3067\u66f8\u304d\u51fa\u3059\u5834\u5408\u306f\u300cWeb\u7528\u306b\u66f8\u304d\u51fa\u3057\u300d\u304b\u3089WebP\u3092\u9078\u629e\u3057\u3001\u54c1\u8cea70\u301c80%\u304c\u76ee\u5b89\u3067\u3059\u3002\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u306fSquoosh\uff08squoosh.app\uff09\u304c\u7121\u6599\u3067\u9ad8\u6027\u80fd\u3067\u3059\u3002\u76ee\u5b89\u306f\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba200KB\u4ee5\u4e0b\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u5931\u65572\uff1a\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3067\u4eba\u7269\u304c\u5207\u308c\u308b<\/h3>\n<p class=\"wp-block-paragraph\">PC\u5411\u3051\u6a2a\u9577\u753b\u50cf\u3092\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3067\u3082\u305d\u306e\u307e\u307e\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u8d77\u304d\u307e\u3059\u3002\u89e3\u6c7a\u7b56\u306f\u2460\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u5c02\u7528\u7e26\u9577\u753b\u50cf\u3092media query\u3067\u5207\u308a\u66ff\u3048\u308b\u3001\u2461`background-position`\u3084`object-position`\u3067\u8868\u793a\u4f4d\u7f6e\u3092\u8abf\u6574\u3059\u308b\u3001\u306e2\u3064\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* PC\u3067\u306f\u4e2d\u592e\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3067\u306f\u4eba\u7269\u306b\u5408\u308f\u305b\u3066\u4f4d\u7f6e\u8abf\u6574 *\/\n.hero {\n  background-position: center center;\n}\n\n@media (max-width: 640px) {\n  .hero {\n    \/* \u53f3\u5bc4\u308a\u306b\u4eba\u7269\u304c\u3044\u308b\u5834\u5408\u306e\u4f8b *\/\n    background-position: 70% center;\n  }\n}<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u5931\u65573\uff1a\u30c6\u30ad\u30b9\u30c8\u304c\u80cc\u666f\u3068\u540c\u5316\u3057\u3066\u8aad\u3081\u306a\u3044<\/h3>\n<p class=\"wp-block-paragraph\">\u660e\u308b\u3044\u80cc\u666f\u753b\u50cf\u306e\u4e0a\u306b\u767d\u6587\u5b57\u3092\u7f6e\u304f\u3068\u3001\u753b\u50cf\u306b\u3088\u3063\u3066\u306f\u8aad\u307f\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002\u89e3\u6c7a\u7b56\u306f\u2460`::before`\u64ec\u4f3c\u8981\u7d20\u3067\u534a\u900f\u660e\u306e\u6697\u5e55\u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\u3092\u8ffd\u52a0\u3001\u2461\u30c6\u30ad\u30b9\u30c8\u306b`text-shadow`\u3092\u8ffd\u52a0\u3001\u2462\u80cc\u666f\u306e\u6697\u3044\u90e8\u5206\u306b\u30c6\u30ad\u30b9\u30c8\u3092\u914d\u7f6e\u3059\u308b\u3088\u3046`object-position`\u3067\u8abf\u6574\u3001\u306e3\u3064\u3067\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u5931\u65574\uff1aalt\u5c5e\u6027\u3092\u7a7a\u306e\u307e\u307e\u88c5\u98fe\u753b\u50cf\u306b\u4f7f\u3063\u3066\u3057\u307e\u3046<\/h3>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u80cc\u666f\u753b\u50cf\u304c\u30c7\u30b6\u30a4\u30f3\u4e0a\u306e\u88c5\u98fe\u306b\u904e\u304e\u306a\u3044\u5834\u5408\uff08\u30c6\u30ad\u30b9\u30c8\u3084\u88fd\u54c1\u5199\u771f\u3067\u306f\u306a\u304f\u62bd\u8c61\u7684\u306a\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u5199\u771f\u306a\u3069\uff09\u3001`alt=&#8221;&#8221;`\uff08\u7a7a\u306ealt\uff09\u304c\u6b63\u3057\u3044\u5bfe\u5fdc\u3067\u3059\u3002\u305f\u3060\u3057\u5546\u54c1\u3084\u4eba\u7269\u306a\u3069\u610f\u5473\u306e\u3042\u308b\u753b\u50cf\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u9069\u5207\u306a\u4ee3\u66ff\u30c6\u30ad\u30b9\u30c8\u3092\u5fc5\u305a\u8a18\u8ff0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u5931\u65575\uff1aCLS\uff08\u7d2f\u7a4d\u30ec\u30a4\u30a2\u30a6\u30c8\u30b7\u30d5\u30c8\uff09\u304c\u767a\u751f\u3059\u308b<\/h3>\n<p class=\"wp-block-paragraph\">img\u30bf\u30b0\u306b`width`\u3068`height`\u5c5e\u6027\u3092\u7701\u7565\u3059\u308b\u3068\u3001\u753b\u50cf\u8aad\u307f\u8fbc\u307f\u524d\u5f8c\u3067\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u30ba\u30ec\u3066CLS\u30b9\u30b3\u30a2\u304c\u60aa\u5316\u3057\u307e\u3059\u3002\u5fc5\u305a\u5b9f\u969b\u306e\u753b\u50cf\u30b5\u30a4\u30ba\u3068\u540c\u3058\u6570\u5024\u3092width\/height\u5c5e\u6027\u306b\u6307\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002CSS\u3067`max-width: 100%`\u3068`height: auto`\u3092\u7d44\u307f\u5408\u308f\u305b\u308c\u3070\u3001\u5c5e\u6027\u5024\u3068CSS\u304c\u5171\u5b58\u3067\u304d\u307e\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<p><!-- roam:retrofit18209-matome --><\/p>\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n<p class=\"wp-block-paragraph\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306f\u3001\u30b5\u30a4\u30c8\u3092\u958b\u3044\u305f\u77ac\u9593\u306b\u5370\u8c61\u3092\u6c7a\u3081\u308b\u6700\u4e0a\u90e8\u306e\u30d3\u30b8\u30e5\u30a2\u30eb\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c8\u306f\u2460\u6a2a\u5e45\u306f1920px\u524d\u5f8c\u3001\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u3067\u8907\u6570\u30b5\u30a4\u30ba\u3092\u7528\u610f\u2461\u4f1d\u3048\u305f\u3044\u30e1\u30c3\u30bb\u30fc\u30b8\u30921\u3064\u306b\u7d5e\u308b\u2462\u6587\u5b57\u306f\u753b\u50cf\u306e\u4e0a\u3067\u3082\u8aad\u3081\u308b\u914d\u8272\u306b\u3059\u308b\u3001\u306e3\u70b9\u3002\u30c7\u30b6\u30a4\u30f3\u4f8b\u3068\u30b5\u30a4\u30ba\u306e\u76ee\u5b89\u3092\u53c2\u8003\u306b\u3001\u76ee\u7684\u306b\u5408\u3063\u305f\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3092\u8a2d\u8a08\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><!-- withmedia-faq --><\/p>\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2>\n<h3 class=\"wp-block-heading\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u306f\u3069\u308c\u304f\u3089\u3044\u304c\u76ee\u5b89\u3067\u3059\u304b\uff1f<\/h3>\n<p class=\"wp-block-paragraph\">WebP\u5f62\u5f0f\u3067200KB\u4ee5\u4e0b\u3092\u76ee\u6a19\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002Google PageSpeed Insights\u3067\u306f\u753b\u50cf\u5727\u7e2e\u306e\u6539\u5584\u63d0\u6848\u304c\u8868\u793a\u3055\u308c\u308b\u306e\u3067\u3001\u5b9a\u671f\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066100\u301c200KB\u306b\u53ce\u307e\u308b\u3088\u3046\u8abf\u6574\u3059\u308b\u306e\u304c\u30d9\u30b9\u30c8\u3067\u3059\u3002\u3069\u3046\u3057\u3066\u3082\u5927\u304d\u304f\u306a\u308b\u5834\u5408\u3067\u3082300KB\u4ee5\u5185\u306b\u6291\u3048\u308b\u3053\u3068\u3092\u63a8\u5968\u3057\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u306e\u9ad8\u3055\u306b\u6c7a\u307e\u308a\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p 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