{"id":18102,"date":"2026-07-14T16:13:32","date_gmt":"2026-07-14T16:13:32","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=18102"},"modified":"2026-09-20T17:10:55","modified_gmt":"2026-09-20T17:10:55","slug":"css-triangle","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/css-triangle\/","title":{"rendered":"\u30102026\u5e74\u7248\u3011CSS\u3067\u4e09\u89d2\u5f62\u3092\u4f5c\u308b\u65b9\u6cd5\uff5cborder\u6280\u6cd5\u30fb\u5439\u304d\u51fa\u3057\u30fb\u77e2\u5370\u3092\u30b3\u30d4\u30da"},"content":{"rendered":"<p class=\"wp-block-paragraph\">CSS\u3067\u4e09\u89d2\u5f62\u3092\u4f5c\u308a\u305f\u3044\u3068\u601d\u3063\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f\u5439\u304d\u51fa\u3057\u306e\u3057\u3063\u307d\u3001\u77e2\u5370\u30a2\u30a4\u30b3\u30f3\u3001\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3\u306e\u958b\u9589\u30de\u30fc\u30af\u2014\u2014Web\u30c7\u30b6\u30a4\u30f3\u306e\u73fe\u5834\u3067\u306f\u4e09\u89d2\u5f62\u306e\u51fa\u756a\u304c\u975e\u5e38\u306b\u591a\u304f\u3001\u300c\u3069\u3046\u3084\u3063\u3066\u5b9f\u88c5\u3059\u308c\u3070\u3044\u3044\u306e\u304b\u300d\u3068\u60a9\u3080\u65b9\u306f\u5c11\u306a\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u753b\u50cf\u3092\u4f7f\u3048\u3070\u624b\u8efd\u3067\u3059\u304c\u3001\u89e3\u50cf\u5ea6\u306e\u554f\u984c\u3084HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u5897\u52a0\u306a\u3069\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3067\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u751f\u3058\u307e\u3059\u3002CSS\u3060\u3051\u3067\u4e09\u89d2\u5f62\u304c\u4f5c\u308c\u308c\u3070\u3001\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u4e0d\u8981\u30fb\u30b3\u30fc\u30c9\u4e00\u767a\u3067\u30b5\u30a4\u30ba\u3084\u8272\u3092\u81ea\u7531\u306b\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001CSS\u3067\u4e09\u89d2\u5f62\u3092\u4f5c\u308b\u3059\u3079\u3066\u306e\u4e3b\u8981\u306a\u624b\u6cd5\u3092\u4f53\u7cfb\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u53e4\u5178\u7684\u306aborder\u30c8\u30ea\u30c3\u30af\u304b\u3089\u3001\u30e2\u30c0\u30f3\u306aclip-path\u307e\u3067\u3001\u30b3\u30d4\u30da\u3057\u3066\u3059\u3050\u306b\u4f7f\u3048\u308b\u30b3\u30fc\u30c9\u3092\u8c4a\u5bcc\u306b\u63b2\u8f09\u3057\u3066\u3044\u307e\u3059\u3002\u300c\u3068\u308a\u3042\u3048\u305a\u4e09\u89d2\u5f62\u304c\u6b32\u3057\u3044\u300d\u3068\u3044\u3046\u65b9\u304b\u3089\u300c\u4ed5\u7d44\u307f\u3092\u3061\u3083\u3093\u3068\u7406\u89e3\u3057\u305f\u3044\u300d\u3068\u3044\u3046\u65b9\u307e\u3067\u3001\u3069\u3061\u3089\u306e\u30cb\u30fc\u30ba\u306b\u3082\u5fdc\u3048\u3089\u308c\u308b\u69cb\u6210\u3067\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">2026\u5e74\u73fe\u5728\u3001\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u306f\u3059\u3079\u3066clip-path\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002border\u6280\u6cd5\u306e\u57fa\u672c\u3092\u62bc\u3055\u3048\u305f\u3046\u3048\u3067\u3001\u3088\u308a\u30e2\u30c0\u30f3\u306a\u5b9f\u88c5\u65b9\u6cd5\u3082\u7fd2\u5f97\u3057\u3066\u304a\u304f\u3068\u3001\u73fe\u5834\u3067\u306e\u5fdc\u7528\u306e\u5e45\u304c\u5927\u304d\u304f\u5e83\u304c\u308a\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u57fa\u790e\u304b\u3089\u9806\u3092\u8ffd\u3063\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">\u5148\u306b\u3001\u3053\u306e\u8a18\u4e8b\u306e\u7d50\u8ad6\u3092\u307e\u3068\u3081\u307e\u3059\u3002<\/h2><!-- vizmedia-batch34-quality:start:css-triangle-01 --><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-01.jpg\" alt=\"\u5148\u306b\u3001\u3053\u306e\u8a18\u4e8b\u306e\u7d50\u8ad6\u3092\u307e\u3068\u3081\u307e\u3059\u3002\" class=\"wp-image-24465\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-01.jpg 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-01-768x432.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-01-1536x864.jpg 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n<!-- vizmedia-batch34-quality:end:css-triangle-01 -->\n\n\n<ul class=\"wp-block-list\">\n<li>CSS\u3067\u4e09\u89d2\u5f62\u3092\u4f5c\u308b\u6700\u3082\u57fa\u672c\u7684\u306a\u624b\u6cd5\u306f\u3001\u8981\u7d20\u306e<code>width<\/code>\u3068<code>height<\/code>\u30920\u306b\u3057\u3066<code>border<\/code>\u306e\u592a\u3055\u3068\u8272\u3092\u64cd\u4f5c\u3059\u308bborder\u6280\u6cd5\u3067\u3059\u3002<\/li>\n<li>\u4e0a\u4e0b\u5de6\u53f3\u306e4\u65b9\u5411\u306e\u4e09\u89d2\u5f62\u306f\u3001\u900f\u660e\u306b\u3059\u308bborder\u306e\u8fba\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u5207\u308a\u66ff\u3048\u3089\u308c\u307e\u3059\u3002<\/li>\n<li>\u5439\u304d\u51fa\u3057\u306e\u3057\u3063\u307d\u306f\u3001\u672c\u4f53\u8981\u7d20\u306e<code>::before<\/code>\u307e\u305f\u306f<code>::after<\/code>\u7591\u4f3c\u8981\u7d20\u306bborder\u4e09\u89d2\u5f62\u3092\u914d\u7f6e\u3059\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>clip-path: polygon() \u3092\u4f7f\u3046\u30e2\u30c0\u30f3\u306a\u65b9\u6cd5\u306f\u3001\u4efb\u610f\u306e\u5f62\u72b6\u30fb\u89d2\u5ea6\u306e\u4e09\u89d2\u5f62\u3092\u76f4\u611f\u7684\u306b\u4f5c\u308c\u3066\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>\u77e2\u5370\u30fb\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3\u30fb\u30ea\u30b9\u30c8\u88c5\u98fe\u306a\u3069\u306e\u5fdc\u7528\u3067\u306f\u3001border\u6280\u6cd5\u3068clip-path\u3092\u4f7f\u3044\u5206\u3051\u308b\u3068\u5b9f\u88c5\u304c\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\">CSS\u3067\u4e09\u89d2\u5f62\u304c\u4f5c\u308c\u308b\u4ed5\u7d44\u307f<\/h2>\n\n<figure class=\"wp-block-image size-large\" data-dia=\"18102-1\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/vizmedia-css-triangle-section-01.jpg\" alt=\"\u4e09\u89d2\u5f62\u304c\u3067\u304d\u308b\u4ed5\u7d44\u307f\" class=\"wp-image-19630\"\/><\/figure>\n\n\n<p class=\"wp-block-paragraph\">CSS\u306e\u4e09\u89d2\u5f62\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001\u307e\u305aborder\u304c\u3069\u306e\u3088\u3046\u306b\u63cf\u753b\u3055\u308c\u308b\u304b\u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u901a\u5e38\u306e\u30dc\u30c3\u30af\u30b9\u8981\u7d20\u306bborder\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u4e0a\u4e0b\u5de6\u53f3\u306e4\u8fba\u304c\u305d\u308c\u305e\u308c\u53f0\u5f62\u3068\u3057\u3066\u63cf\u753b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u8981\u7d20\u306e\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044\u5834\u5408\u306f\u53f0\u5f62\u304c\u7d30\u304f\u306a\u3063\u3066\u300c\u7dda\u300d\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u306f\u96a3\u63a5\u3059\u308b\u8fba\u3068\u659c\u3081\u306b\u63a5\u5408\u3055\u308c\u305f\u53f0\u5f62\u3067\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u91cd\u8981\u306a\u767a\u898b\u304c\u3042\u308a\u307e\u3059\u3002\u8981\u7d20\u306e<code>width<\/code>\u3068<code>height<\/code>\u3092\u4e21\u65b9\u3068\u30820\u306b\u3059\u308b\u3068\u30014\u8fba\u306e\u53f0\u5f62\u304c\u3059\u3079\u3066\u4e2d\u5fc3\u306e1\u70b9\u306b\u5411\u304b\u3063\u3066\u53ce\u675f\u3057\u3001\u305d\u308c\u305e\u308c\u304c\u300c\u4e09\u89d2\u5f62\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u72b6\u614b\u30673\u8fba\u3092\u900f\u660e\uff08transparent\uff09\u306b\u3057\u30661\u8fba\u3060\u3051\u8272\u3092\u4ed8\u3051\u308b\u3068\u3001\u305d\u306e\u4e09\u89d2\u5f62\u3060\u3051\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u304cborder\u3092\u4f7f\u3063\u305fCSS\u4e09\u89d2\u5f62\u306e\u539f\u7406\u3067\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u7684\u306a\u4f8b\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u4e09\u89d2\u5f62\uff08\u4e0a\u5411\u304d\uff09 *\/\n.triangle {\n  width: 0;\n  height: 0;\n  border-left: 30px solid transparent;\n  border-right: 30px solid transparent;\n  border-bottom: 50px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5de6\u53f3\u306eborder\u3092\u900f\u660e\u306b\u3057\u3066\u3001\u4e0b\u306eborder\u3060\u3051\u306b\u30d4\u30f3\u30af\u8272\u3092\u4ed8\u3051\u3066\u3044\u307e\u3059\u3002\u5e450\u30fb\u9ad8\u30550\u306e\u8981\u7d20\u306e\u4e2d\u5fc3\u306b\u5411\u304b\u3063\u3066\u4e0b\u5074\u306eborder\u304c\u4e09\u89d2\u5f62\u3092\u5f62\u6210\u3057\u3001\u5de6\u53f3\u306eborder\u306f\u900f\u660e\u306a\u306e\u3067\u898b\u3048\u307e\u305b\u3093\u3002\u7d50\u679c\u3068\u3057\u3066\u4e0a\u3092\u5411\u3044\u305f\u4e09\u89d2\u5f62\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002border\u306e\u592a\u3055\u304c\u4e09\u89d2\u5f62\u306e\u30b5\u30a4\u30ba\u3092\u6c7a\u3081\u308b\u306e\u3067\u3001\u5024\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u5927\u304d\u3055\u3084\u7e26\u6a2a\u6bd4\u3092\u81ea\u7531\u306b\u8abf\u6574\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u306a\u305c\u300cborder-bottom\u300d\u3067\u300c\u4e0a\u5411\u304d\u4e09\u89d2\u5f62\u300d\u306b\u306a\u308b\u306e\u304b\u3001\u6700\u521d\u306f\u6df7\u4e71\u3057\u304c\u3061\u3067\u3059\u3002\u8003\u3048\u65b9\u306e\u30b3\u30c4\u306f\u300c\u6b8b\u3057\u305f\u3044\u8272\u306e\u8fba\u306e\u53cd\u5bfe\u65b9\u5411\u306b\u4e09\u89d2\u5f62\u306e\u9802\u70b9\u304c\u5411\u304f\u300d\u3068\u899a\u3048\u308b\u3053\u3068\u3067\u3059\u3002border-bottom\u306b\u8272\u3092\u4ed8\u3051\u308b\u3068\u3001\u305d\u306e\u53f0\u5f62\u306e\u5e95\u8fba\uff08\u4e0b\u5074\uff09\u304c\u6b8b\u308a\u3001\u9802\u70b9\u306f\u4e0a\u3092\u5411\u304d\u307e\u3059\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">\u4e0a\u30fb\u4e0b\u30fb\u5de6\u30fb\u53f3\u306e\u4e09\u89d2\u5f62\u306e\u4f5c\u308a\u65b9<\/h2>\n\n<figure class=\"wp-block-image size-large\" data-dia=\"18102-2\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/vizmedia-css-triangle-section-02.jpg\" alt=\"\u5411\u304d\u3068\u8272\u3092\u4ed8\u3051\u308b\u8fba\" class=\"wp-image-19631\"\/><\/figure>\n\n\n<p class=\"wp-block-paragraph\">4\u65b9\u5411\u3059\u3079\u3066\u306e\u4e09\u89d2\u5f62\u3092\u4f5c\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u57fa\u672c\u7684\u306a\u30eb\u30fc\u30eb\u306f\u300c\u8272\u3092\u4ed8\u3051\u308b\u8fba\u306e\u53cd\u5bfe\u5074\u306b\u9802\u70b9\u304c\u5411\u304f\u300d\u3067\u3059\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u4e0a\u5411\u304d\u4e09\u89d2\u5f62<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0a\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.triangle-up {\n  width: 0;\n  height: 0;\n  border-left: 40px solid transparent;\n  border-right: 40px solid transparent;\n  border-bottom: 60px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u4e0b\u5411\u304d\u4e09\u89d2\u5f62<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0b\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.triangle-down {\n  width: 0;\n  height: 0;\n  border-left: 40px solid transparent;\n  border-right: 40px solid transparent;\n  border-top: 60px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u5de6\u5411\u304d\u4e09\u89d2\u5f62<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5de6\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.triangle-left {\n  width: 0;\n  height: 0;\n  border-top: 40px solid transparent;\n  border-bottom: 40px solid transparent;\n  border-right: 60px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u53f3\u5411\u304d\u4e09\u89d2\u5f62<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u53f3\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.triangle-right {\n  width: 0;\n  height: 0;\n  border-top: 40px solid transparent;\n  border-bottom: 40px solid transparent;\n  border-left: 60px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">4\u65b9\u5411\u306e\u4e09\u89d2\u5f62\u3092\u307e\u3068\u3081\u3066HTML\u3067\u4f7f\u3046\u5834\u5408\u306e\u30b5\u30f3\u30d7\u30eb\u3082\u8f09\u305b\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-markup\" data-lang=\"HTML\"><code>&lt;div class=\"triangle-up\"&gt;&lt;\/div&gt;\n&lt;div class=\"triangle-down\"&gt;&lt;\/div&gt;\n&lt;div class=\"triangle-left\"&gt;&lt;\/div&gt;\n&lt;div class=\"triangle-right\"&gt;&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30a4\u30ba\u306e\u8abf\u6574\u65b9\u6cd5\u3092\u6574\u7406\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u5de6\u5411\u304d\u30fb\u53f3\u5411\u304d\u4e09\u89d2\u5f62\u3067\u306f\u3001\u4e0a\u4e0b\u306eborder\u306e\u5024\u304c\u300c\u4e09\u89d2\u5f62\u306e\u9ad8\u3055\uff08\u5de6\u53f3\u5e45\u306e\u534a\u5206\uff09\u300d\u306b\u306a\u308a\u3001\u5de6\u53f3\u3069\u3061\u3089\u304b\u306eborder\u306e\u5024\u304c\u300c\u4e09\u89d2\u5f62\u306e\u5965\u884c\u304d\uff08\u9ad8\u3055\uff09\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u4e0a\u5411\u304d\u30fb\u4e0b\u5411\u304d\u306f\u9006\u306b\u3001\u5de6\u53f3\u306eborder\u304c\u6a2a\u5e45\u306e\u534a\u5206\u3001\u4e0a\u4e0b\u306eborder\u304c\u7e26\u306e\u9577\u3055\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u4e09\u89d2\u5f62\u306e\u5411\u304d<\/th><th>\u8272\u3092\u4ed8\u3051\u308bborder<\/th><th>\u900f\u660e\u306b\u3059\u308bborder<\/th><\/tr><\/thead><tbody><tr><td>\u4e0a\u5411\u304d<\/td><td>border-bottom<\/td><td>border-left \/ border-right<\/td><\/tr><tr><td>\u4e0b\u5411\u304d<\/td><td>border-top<\/td><td>border-left \/ border-right<\/td><\/tr><tr><td>\u5de6\u5411\u304d<\/td><td>border-right<\/td><td>border-top \/ border-bottom<\/td><\/tr><tr><td>\u53f3\u5411\u304d<\/td><td>border-left<\/td><td>border-top \/ border-bottom<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<h2 class=\"wp-block-heading\">\u76f4\u89d2\u4e09\u89d2\u5f62\u30fb\u659c\u3081\u4e09\u89d2\u5f62\u306e\u4f5c\u308a\u65b9<\/h2><!-- vizmedia-batch34-quality:start:css-triangle-04 --><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-04.jpg\" alt=\"\u76f4\u89d2\u4e09\u89d2\u5f62\u30fb\u659c\u3081\u4e09\u89d2\u5f62\u306e\u4f5c\u308a\u65b9\" class=\"wp-image-24466\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-04.jpg 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-04-768x432.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-04-1536x864.jpg 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n<!-- vizmedia-batch34-quality:end:css-triangle-04 -->\n\n\n<p class=\"wp-block-paragraph\">border\u6280\u6cd5\u3067\u306f\u30012\u8fba\u306eborder\u306b\u8272\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u76f4\u89d2\u4e09\u89d2\u5f62\uff08\u659c\u3081\u306e\u8fba\u304c\u3042\u308b\u4e09\u89d2\u5f62\uff09\u3092\u4f5c\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u4e0a\u4e0b\u5de6\u53f3\u306eborder\u30b5\u30a4\u30ba\u3092\u975e\u5bfe\u79f0\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u4efb\u610f\u306e\u89d2\u5ea6\u306b\u8fd1\u3044\u4e09\u89d2\u5f62\u3092\u8868\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u89d2\u4e09\u89d2\u5f62\uff08\u5de6\u4e0a\u306b\u76f4\u89d2\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5de6\u4e0a\u306b\u76f4\u89d2\u304c\u3042\u308b\u4e09\u89d2\u5f62 *\/\n.triangle-topleft {\n  width: 0;\n  height: 0;\n  border-top: 80px solid #d16176;\n  border-right: 80px solid transparent;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u89d2\u4e09\u89d2\u5f62\uff08\u53f3\u4e0a\u306b\u76f4\u89d2\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u53f3\u4e0a\u306b\u76f4\u89d2\u304c\u3042\u308b\u4e09\u89d2\u5f62 *\/\n.triangle-topright {\n  width: 0;\n  height: 0;\n  border-top: 80px solid #d16176;\n  border-left: 80px solid transparent;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u89d2\u4e09\u89d2\u5f62\uff08\u5de6\u4e0b\u306b\u76f4\u89d2\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5de6\u4e0b\u306b\u76f4\u89d2\u304c\u3042\u308b\u4e09\u89d2\u5f62 *\/\n.triangle-bottomleft {\n  width: 0;\n  height: 0;\n  border-bottom: 80px solid #d16176;\n  border-right: 80px solid transparent;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u89d2\u4e09\u89d2\u5f62\uff08\u53f3\u4e0b\u306b\u76f4\u89d2\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u53f3\u4e0b\u306b\u76f4\u89d2\u304c\u3042\u308b\u4e09\u89d2\u5f62 *\/\n.triangle-bottomright {\n  width: 0;\n  height: 0;\n  border-bottom: 80px solid #d16176;\n  border-left: 80px solid transparent;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u7e26\u6a2a\u6bd4\u3092\u5909\u3048\u305f\u7d30\u9577\u3044\u4e09\u89d2\u5f62<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5de6\u53f3\u306eborder\u3068\u4e0a\u4e0b\u306eborder\u306e\u6bd4\u7387\u3092\u5909\u3048\u308b\u3053\u3068\u3067\u3001\u7d30\u3044\u4e09\u89d2\u5f62\u3084\u6a2a\u306b\u5e83\u3044\u4e09\u89d2\u5f62\u3092\u4f5c\u308c\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u7e26\u9577\u306e\u7d30\u3044\u4e09\u89d2\u5f62\uff08\u4e0a\u5411\u304d\uff09 *\/\n.triangle-slim {\n  width: 0;\n  height: 0;\n  border-left: 15px solid transparent;\n  border-right: 15px solid transparent;\n  border-bottom: 80px solid #d16176;\n}\n\n\/* \u6a2a\u306b\u5e83\u3044\u4e09\u89d2\u5f62\uff08\u4e0a\u5411\u304d\uff09 *\/\n.triangle-wide {\n  width: 0;\n  height: 0;\n  border-left: 80px solid transparent;\n  border-right: 80px solid transparent;\n  border-bottom: 30px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">border\u6280\u6cd5\u3067\u306f\u5b8c\u5168\u306a\u4efb\u610f\u89d2\u5ea6\u306e\u4e09\u89d2\u5f62\u306f\u96e3\u3057\u3044\u3067\u3059\u304c\u3001\u5de6\u53f3\u306eborder\u5e45\u3068\u4e0a\u4e0b\u306eborder\u5e45\u306e\u6bd4\u7387\u3092\u5909\u3048\u308b\u3053\u3068\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u5f62\u72b6\u3092\u8fd1\u4f3c\u3067\u304d\u307e\u3059\u3002\u6b63\u78ba\u306a\u89d2\u5ea6\u6307\u5b9a\u304c\u5fc5\u8981\u306a\u5834\u5408\u306fclip-path\uff08\u5f8c\u8ff0\uff09\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">\u5439\u304d\u51fa\u3057\uff08\u3075\u304d\u3060\u3057\uff09\u3092\u4e09\u89d2\u5f62\u3067\u4f5c\u308b<\/h2>\n\n<figure class=\"wp-block-image size-large\" data-dia=\"18102-3\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/vizmedia-css-triangle-section-03.jpg\" alt=\"\u5439\u304d\u51fa\u3057\u306e\u4f5c\u308a\u65b9\" class=\"wp-image-19632\"\/><\/figure>\n\n\n<p class=\"wp-block-paragraph\">Web\u30c7\u30b6\u30a4\u30f3\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b\u5439\u304d\u51fa\u3057\uff08\u3075\u304d\u3060\u3057\uff09\u306f\u3001\u9577\u65b9\u5f62\u306e\u672c\u4f53\u3068\u4e09\u89d2\u5f62\u306e\u3057\u3063\u307d\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u5f62\u3067\u3059\u3002CSS\u3067\u306f\u672c\u4f53\u8981\u7d20\u306e<code>::before<\/code>\u307e\u305f\u306f<code>::after<\/code>\u7591\u4f3c\u8981\u7d20\u306b\u4e09\u89d2\u5f62\u3092\u914d\u7f6e\u3059\u308b\u3053\u3068\u3067\u3001\u753b\u50cf\u306a\u3057\u3067\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u306e\u5439\u304d\u51fa\u3057\uff08\u4e0b\u306b\u3057\u3063\u307d\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-markup\" data-lang=\"HTML\"><code>&lt;div class=\"balloon\"&gt;\u3053\u3093\u306b\u3061\u306f\uff01&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0b\u306b\u3057\u3063\u307d\u304c\u51fa\u308b\u5439\u304d\u51fa\u3057 *\/\n.balloon {\n  position: relative;\n  display: inline-block;\n  background-color: #EFBDB7;\n  border-radius: 6px;\n  padding: 12px 20px;\n  font-size: 16px;\n  color: #51322b;\n}\n\n.balloon::after {\n  content: \"\";\n  position: absolute;\n  bottom: -20px;       \/* \u672c\u4f53\u306e\u4e0b\u306b\u914d\u7f6e *\/\n  left: 50%;\n  transform: translateX(-50%);\n  width: 0;\n  height: 0;\n  border-left: 12px solid transparent;\n  border-right: 12px solid transparent;\n  border-top: 20px solid #EFBDB7;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u4e0a\u306b\u3057\u3063\u307d\u304c\u51fa\u308b\u5439\u304d\u51fa\u3057<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0a\u306b\u3057\u3063\u307d\u304c\u51fa\u308b\u5439\u304d\u51fa\u3057 *\/\n.balloon-top {\n  position: relative;\n  display: inline-block;\n  background-color: #EFBDB7;\n  border-radius: 6px;\n  padding: 12px 20px;\n  font-size: 16px;\n  color: #51322b;\n  margin-top: 20px;  \/* \u3057\u3063\u307d\u5206\u306e\u4f59\u767d *\/\n}\n\n.balloon-top::before {\n  content: \"\";\n  position: absolute;\n  top: -20px;\n  left: 50%;\n  transform: translateX(-50%);\n  width: 0;\n  height: 0;\n  border-left: 12px solid transparent;\n  border-right: 12px solid transparent;\n  border-bottom: 20px solid #EFBDB7;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u5de6\u306b\u3057\u3063\u307d\u304c\u51fa\u308b\u5439\u304d\u51fa\u3057\uff08\u30c1\u30e3\u30c3\u30c8\u98a8\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5de6\u306b\u3057\u3063\u307d\u304c\u51fa\u308b\u5439\u304d\u51fa\u3057 *\/\n.balloon-left {\n  position: relative;\n  display: inline-block;\n  background-color: #EFBDB7;\n  border-radius: 6px;\n  padding: 12px 20px;\n  font-size: 16px;\n  color: #51322b;\n  margin-left: 20px;  \/* \u3057\u3063\u307d\u5206\u306e\u4f59\u767d *\/\n}\n\n.balloon-left::before {\n  content: \"\";\n  position: absolute;\n  top: 50%;\n  left: -20px;\n  transform: translateY(-50%);\n  width: 0;\n  height: 0;\n  border-top: 10px solid transparent;\n  border-bottom: 10px solid transparent;\n  border-right: 20px solid #EFBDB7;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u67a0\u7dda\u4ed8\u304d\u5439\u304d\u51fa\u3057<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5439\u304d\u51fa\u3057\u306b\u67a0\u7dda\u3092\u4ed8\u3051\u305f\u3044\u5834\u5408\u306f\u3001<code>::before<\/code>\u3068<code>::after<\/code>\u306e2\u3064\u306e\u7591\u4f3c\u8981\u7d20\u3092\u91cd\u306d\u3066\u4f7f\u3044\u307e\u3059\u3002\u5916\u5074\uff08<code>::before<\/code>\uff09\u306b\u67a0\u7dda\u8272\u306e\u4e09\u89d2\u5f62\u3001\u5185\u5074\uff08<code>::after<\/code>\uff09\u306b\u80cc\u666f\u8272\u306e\u4e09\u89d2\u5f62\u3092\u5c11\u3057\u305a\u3089\u3057\u3066\u914d\u7f6e\u3059\u308b\u624b\u6cd5\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u67a0\u7dda\u4ed8\u304d\u5439\u304d\u51fa\u3057\uff08\u4e0b\u306b\u3057\u3063\u307d\uff09 *\/\n.balloon-bordered {\n  position: relative;\n  display: inline-block;\n  background-color: #fff;\n  border: 2px solid #d16176;\n  border-radius: 6px;\n  padding: 12px 20px;\n  font-size: 16px;\n  color: #51322b;\n}\n\n\/* \u5916\u5074\u306e\u4e09\u89d2\u5f62\uff08\u67a0\u7dda\u8272\uff09 *\/\n.balloon-bordered::before {\n  content: \"\";\n  position: absolute;\n  bottom: -24px;\n  left: 50%;\n  transform: translateX(-50%);\n  width: 0;\n  height: 0;\n  border-left: 14px solid transparent;\n  border-right: 14px solid transparent;\n  border-top: 24px solid #d16176;\n}\n\n\/* \u5185\u5074\u306e\u4e09\u89d2\u5f62\uff08\u80cc\u666f\u8272\uff09 *\/\n.balloon-bordered::after {\n  content: \"\";\n  position: absolute;\n  bottom: -20px;\n  left: 50%;\n  transform: translateX(-50%);\n  width: 0;\n  height: 0;\n  border-left: 12px solid transparent;\n  border-right: 12px solid transparent;\n  border-top: 20px solid #fff;\n}<\/code><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u7591\u4f3c\u8981\u7d20\u30922\u679a\u91cd\u306d\u308b\u65b9\u6cd5\u306f\u3001<code>::before<\/code>\u304c<code>::after<\/code>\u3088\u308a2px\u307b\u3069\u5927\u304d\u304f\u4e0b\u306b\u914d\u7f6e\u3055\u308c\u308b\u3053\u3068\u3067\u3001\u67a0\u7dda\u304c\u4e09\u89d2\u5f62\u306b\u3082\u81ea\u7136\u306b\u3064\u306a\u304c\u3063\u3066\u898b\u3048\u307e\u3059\u3002<code>z-index<\/code>\u306e\u8abf\u6574\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u672c\u4f53\u8981\u7d20\u306b<code>position: relative; z-index: 1;<\/code>\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">clip-path: polygon() \u3067\u4e09\u89d2\u5f62\u3092\u4f5c\u308b\u30e2\u30c0\u30f3\u306a\u65b9\u6cd5<\/h2>\n\n<figure class=\"wp-block-image size-large\" data-dia=\"18102-4\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/vizmedia-css-triangle-section-04.jpg\" alt=\"border\u6280\u3068clip-path\" class=\"wp-image-19633\"\/><\/figure>\n\n\n<p class=\"wp-block-paragraph\"><code>clip-path: polygon()<\/code>\u306f\u8981\u7d20\u3092\u4efb\u610f\u306e\u591a\u89d2\u5f62\u306b\u304f\u308a\u629c\u304fCSS\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002border\u6280\u6cd5\u3068\u9055\u3044\u3001\u8981\u7d20\u81ea\u4f53\u306b\u5e45\u30fb\u9ad8\u3055\u3092\u6301\u305f\u305b\u305f\u307e\u307e\u4e09\u89d2\u5f62\u306b\u898b\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5ea7\u6a19\u3092\u76f4\u63a5\u6307\u5b9a\u3059\u308b\u305f\u3081\u4efb\u610f\u306e\u89d2\u5ea6\u3092\u6b63\u78ba\u306b\u8868\u73fe\u3067\u304d\u3001CSS\u30c8\u30e9\u30f3\u30b8\u30b7\u30e7\u30f3\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5316\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587\u3068\u5ea7\u6a19\u306e\u8003\u3048\u65b9<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><code>polygon()<\/code>\u306e\u5ea7\u6a19\u306f\u300c\u5de6\u4e0a\u3092\u539f\u70b9(0%, 0%)\u3068\u3057\u305f\u76f8\u5bfe\u5ea7\u6a19\u300d\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002\u53f3\u4e0b\u304c(100%, 100%)\u3067\u3059\u3002\u4e09\u89d2\u5f62\u306f3\u70b9\u306e\u5ea7\u6a19\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0a\u5411\u304d\u4e09\u89d2\u5f62\uff08clip-path\u4f7f\u7528\uff09 *\/\n.triangle-clip-up {\n  width: 0;         \/* clip-path\u306e\u5834\u5408\u306f\u5e45\u30fb\u9ad8\u3055\u3092\u8a2d\u5b9a\u3059\u308b *\/\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);\n  \/* \u9802\u70b9(\u4e0a\u4e2d\u592e), \u5de6\u4e0b, \u53f3\u4e0b *\/\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">4\u65b9\u5411\u306e\u4e09\u89d2\u5f62\uff08clip-path\u7248\uff09<\/h3>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0a\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.clip-up {\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);\n}\n\n\/* \u4e0b\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.clip-down {\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(0% 0%, 100% 0%, 50% 100%);\n}\n\n\/* \u5de6\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.clip-left {\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(0% 50%, 100% 0%, 100% 100%);\n}\n\n\/* \u53f3\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.clip-right {\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(0% 0%, 100% 50%, 0% 100%);\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u4efb\u610f\u89d2\u5ea6\u306e\u4e09\u89d2\u5f62<\/h3>\n\n\n<p class=\"wp-block-paragraph\">clip-path\u306e\u5927\u304d\u306a\u5229\u70b9\u306f\u4efb\u610f\u306e\u5ea7\u6a19\u3092\u6307\u5b9a\u3067\u304d\u308b\u3053\u3068\u3067\u3059\u3002\u4f8b\u3048\u3070\u300c\u5c11\u3057\u53f3\u306b\u50be\u3044\u305f\u4e09\u89d2\u5f62\u300d\u306a\u3069\u3082\u7c21\u5358\u306b\u4f5c\u308c\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u975e\u5bfe\u79f0\u306a\u4e09\u89d2\u5f62\uff08\u9802\u70b9\u304c\u53f3\u5bc4\u308a\uff09 *\/\n.clip-asymmetric {\n  width: 120px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(70% 0%, 0% 100%, 100% 100%);\n}\n\n\/* \u76f4\u89d2\u4e09\u89d2\u5f62\uff08\u5de6\u4e0b\u306b\u76f4\u89d2\uff09 *\/\n.clip-right-angle {\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(0% 0%, 0% 100%, 100% 100%);\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">clip-path\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u308b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">clip-path\u306fCSS\u30c8\u30e9\u30f3\u30b8\u30b7\u30e7\u30f3\u306e\u5bfe\u8c61\u306b\u306a\u308a\u307e\u3059\u3002\u5f62\u72b6\u3092\u30e2\u30fc\u30d5\u30a3\u30f3\u30b0\u3055\u305b\u308b\u6f14\u51fa\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30db\u30d0\u30fc\u3067\u4e09\u89d2\u5f62\u304c\u56de\u8ee2\u3059\u308b\u3088\u3046\u306a\u5909\u5f62 *\/\n.clip-animated {\n  width: 100px;\n  height: 100px;\n  background-color: #d16176;\n  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);\n  transition: clip-path 0.4s ease;\n}\n\n.clip-animated:hover {\n  clip-path: polygon(50% 100%, 0% 0%, 100% 0%);\n  \/* \u4e0a\u5411\u304d \u2192 \u4e0b\u5411\u304d\u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 *\/\n}<\/code><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">border\u6280\u6cd5\u3067\u306ftransition\u306b\u3088\u308b\u30e2\u30fc\u30d5\u30a3\u30f3\u30b0\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u5fc5\u8981\u306a\u5834\u9762\u3067\u306fclip-path\u3092\u9078\u629e\u3057\u307e\u3057\u3087\u3046\u3002\u30d6\u30e9\u30a6\u30b6\u30b5\u30dd\u30fc\u30c8\u306f2026\u5e74\u73fe\u5728\u3001\u3059\u3079\u3066\u306e\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\uff08Chrome\/Firefox\/Safari\/Edge\uff09\u3067\u5bfe\u5fdc\u6e08\u307f\u3067\u3059\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u89d2\u5f62\u306e\u5fdc\u7528\uff08\u77e2\u5370\u30fb\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3\u30fb\u30ea\u30b9\u30c8\u88c5\u98fe\uff09<\/h2><!-- vizmedia-batch34-quality:start:css-triangle-07 --><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-07.jpg\" alt=\"\u4e09\u89d2\u5f62\u306e\u5fdc\u7528\uff08\u77e2\u5370\u30fb\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3\u30fb\u30ea\u30b9\u30c8\u88c5\u98fe\uff09\" class=\"wp-image-24467\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-07.jpg 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-07-768x432.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-07-1536x864.jpg 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n<!-- vizmedia-batch34-quality:end:css-triangle-07 -->\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306eWeb\u30b5\u30a4\u30c8\u3067\u4e09\u89d2\u5f62\u304c\u4f7f\u308f\u308c\u308b\u5834\u9762\u306f\u591a\u5c90\u306b\u308f\u305f\u308a\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a\u5fdc\u7528\u4f8b\u3092\u30b3\u30fc\u30c9\u3064\u304d\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u77e2\u5370\u30a2\u30a4\u30b3\u30f3\u3092CSS\u3067\u4f5c\u308b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u30dc\u30bf\u30f3\u306e\u53f3\u7aef\u306b\u8868\u793a\u3059\u308b\u77e2\u5370\u306f\u3001border\u6280\u6cd5\u306e\u4e09\u89d2\u5f62\u306b\u672c\u4f53\u306eborder\uff08\u30c6\u30ad\u30b9\u30c8\u306e\u4e0b\u7dda\u30fb\u53f3\u7dda\uff09\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u65b9\u6cd5\u3082\u4fbf\u5229\u3067\u3059\u304c\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u4e09\u89d2\u5f62\u77e2\u5370\u3082\u5e83\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-markup\" data-lang=\"HTML\"><code>&lt;a class=\"btn-arrow\" href=\"#\"&gt;\u8a73\u3057\u304f\u898b\u308b &lt;span class=\"arrow\"&gt;&lt;\/span&gt;&lt;\/a&gt;<\/code><\/pre><\/div>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.btn-arrow {\n  display: inline-flex;\n  align-items: center;\n  gap: 8px;\n  padding: 12px 24px;\n  background-color: #d16176;\n  color: #fff;\n  text-decoration: none;\n  border-radius: 4px;\n  font-size: 16px;\n}\n\n.btn-arrow .arrow {\n  display: inline-block;\n  width: 0;\n  height: 0;\n  border-top: 6px solid transparent;\n  border-bottom: 6px solid transparent;\n  border-left: 10px solid #fff;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3\u306e\u958b\u9589\u30de\u30fc\u30af<\/h3>\n\n\n<p class=\"wp-block-paragraph\">FAQ\u30fb\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3UI\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b\u300c\u958b\u3044\u3066\u3044\u308b\u3068\u304d\u25b2\u30fb\u9589\u3058\u3066\u3044\u308b\u3068\u304d\u25bc\u300d\u306e\u5207\u308a\u66ff\u3048\u3092CSS\u3060\u3051\u3067\u5b9f\u88c5\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-markup\" data-lang=\"HTML\"><code>&lt;details class=\"accordion\"&gt;\n  &lt;summary class=\"accordion-title\"&gt;\u8cea\u554f\u306e\u30c6\u30ad\u30b9\u30c8\u304c\u3053\u3053\u306b\u5165\u308a\u307e\u3059&lt;\/summary&gt;\n  &lt;div class=\"accordion-body\"&gt;\u56de\u7b54\u306e\u30c6\u30ad\u30b9\u30c8\u304c\u3053\u3053\u306b\u5165\u308a\u307e\u3059\u3002&lt;\/div&gt;\n&lt;\/details&gt;<\/code><\/pre><\/div>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.accordion {\n  border: 1px solid #EFBDB7;\n  border-radius: 4px;\n  margin-bottom: 8px;\n}\n\n.accordion-title {\n  display: flex;\n  justify-content: space-between;\n  align-items: center;\n  padding: 16px 20px;\n  cursor: pointer;\n  list-style: none;\n  font-size: 16px;\n  color: #51322b;\n}\n\n\/* \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u25b6\u30de\u30fc\u30af\u3092\u6d88\u3059 *\/\n.accordion-title::-webkit-details-marker { display: none; }\n\n\/* \u9589\u3058\u3066\u3044\u308b\u3068\u304d\uff1a\u4e0b\u5411\u304d\u4e09\u89d2\u5f62 *\/\n.accordion-title::after {\n  content: \"\";\n  display: inline-block;\n  width: 0;\n  height: 0;\n  border-left: 7px solid transparent;\n  border-right: 7px solid transparent;\n  border-top: 10px solid #d16176;\n  transition: transform 0.3s ease;\n}\n\n\/* \u958b\u3044\u3066\u3044\u308b\u3068\u304d\uff1a\u4e0a\u5411\u304d\u4e09\u89d2\u5f62\uff08\u56de\u8ee2\u3067\u5b9f\u73fe\uff09 *\/\n.accordion[open] .accordion-title::after {\n  transform: rotate(180deg);\n}\n\n.accordion-body {\n  padding: 0 20px 16px;\n  color: #51322b;\n  font-size: 15px;\n  line-height: 1.8;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u30ea\u30b9\u30c8\u306e\u88c5\u98fe\uff08bullet \u3092\u4e09\u89d2\u5f62\u306b\uff09<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30ea\u30b9\u30c8\u306e\u9ed2\u4e38\uff08\u25cf\uff09\u3092\u4e09\u89d2\u5f62\u306b\u5909\u3048\u308b\u3068\u3001\u30c7\u30b6\u30a4\u30f3\u306b\u30a2\u30af\u30bb\u30f3\u30c8\u304c\u52a0\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-markup\" data-lang=\"HTML\"><code>&lt;ul class=\"triangle-list\"&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u30a2\u30a4\u30c6\u30e01&lt;\/li&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u30a2\u30a4\u30c6\u30e02&lt;\/li&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u30a2\u30a4\u30c6\u30e03&lt;\/li&gt;\n&lt;\/ul&gt;<\/code><\/pre><\/div>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.triangle-list {\n  list-style: none;\n  padding: 0;\n  margin: 0;\n}\n\n.triangle-list li {\n  position: relative;\n  padding-left: 20px;\n  margin-bottom: 8px;\n  font-size: 16px;\n  line-height: 1.6;\n  color: #51322b;\n}\n\n.triangle-list li::before {\n  content: \"\";\n  position: absolute;\n  left: 0;\n  top: 7px;   \/* \u30c6\u30ad\u30b9\u30c8\u306e\u884c\u9ad8\u3055\u306b\u5408\u308f\u305b\u3066\u8abf\u6574 *\/\n  width: 0;\n  height: 0;\n  border-top: 5px solid transparent;\n  border-bottom: 5px solid transparent;\n  border-left: 9px solid #d16176;\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u30bb\u30af\u30b7\u30e7\u30f3\u533a\u5207\u308a\u306e\u4e09\u89d2\u5f62\uff08\u30da\u30fc\u30b8\u30c7\u30b6\u30a4\u30f3\uff09<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u30bb\u30af\u30b7\u30e7\u30f3\u9593\u306e\u5883\u754c\u306b\u5927\u304d\u306a\u4e09\u89d2\u5f62\u3092\u7f6e\u3044\u3066\u3001\u6d41\u308c\u308b\u3088\u3046\u306a\u533a\u5207\u308a\u3092\u8868\u73fe\u3059\u308b\u624b\u6cd5\u3067\u3059\u3002clip-path\u3092\u4f7f\u3046\u3068\u5b9f\u88c5\u304c\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30bb\u30af\u30b7\u30e7\u30f3\u4e0b\u7aef\u306b\u4e09\u89d2\u5f62\u306e\u5207\u308a\u8fbc\u307f\u3092\u5165\u308c\u308b *\/\n.section-cut {\n  position: relative;\n  background-color: #d16176;\n  padding: 60px 0 80px;\n  clip-path: polygon(0 0, 100% 0, 100% 85%, 50% 100%, 0 85%);\n}\n\n\/* \u4e0a\u304b\u3089\u4e0b\u3078\u306e\u6d41\u308c\u308b\u3088\u3046\u306a\u533a\u5207\u308a *\/\n.section-wave {\n  width: 100%;\n  height: 60px;\n  background-color: #EFBDB7;\n  clip-path: polygon(0 0, 100% 0, 50% 100%);\n}<\/code><\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2><!-- vizmedia-batch34-quality:start:css-triangle-08 --><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-08.jpg\" alt=\"\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09\" class=\"wp-image-24468\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-08.jpg 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-08-768x432.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-08-1536x864.jpg 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n<!-- vizmedia-batch34-quality:end:css-triangle-08 -->\n\n\n<h3 class=\"wp-block-heading\">Q. border\u6280\u6cd5\u3068clip-path\u306f\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u7528\u9014\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u306e\u304c\u30d9\u30b9\u30c8\u3067\u3059\u3002border\u6280\u6cd5\u306f\u53e4\u304f\u304b\u3089\u3042\u308b\u624b\u6cd5\u3067\u30d6\u30e9\u30a6\u30b6\u4e92\u63db\u6027\u304c\u975e\u5e38\u306b\u9ad8\u304f\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u4e0a\u4e0b\u5de6\u53f3\u306e\u4e09\u89d2\u5f62\u30fb\u5439\u304d\u51fa\u3057\u306e\u3057\u3063\u307d\u306b\u5411\u3044\u3066\u3044\u307e\u3059\u3002\u8981\u7d20\u306ewidth\/height\u304c0\u306b\u306a\u308b\u70b9\u3092\u7406\u89e3\u3057\u3066\u3044\u308c\u3070\u76f4\u611f\u7684\u306b\u4f7f\u3048\u307e\u3059\u3002clip-path\u306f\u4efb\u610f\u306e\u5ea7\u6a19\u6307\u5b9a\u304c\u3067\u304d\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5bfe\u5fdc\u30fb\u8981\u7d20\u306b\u5e45\u3068\u9ad8\u3055\u3092\u6301\u305f\u305b\u305f\u307e\u307e\u304f\u308a\u629c\u3051\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u30022026\u5e74\u73fe\u5728\u306f\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u5168\u5bfe\u5fdc\u306a\u306e\u3067\u3001\u65b0\u898f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306fclip-path\u3092\u7a4d\u6975\u7684\u306b\u63a1\u7528\u3059\u308b\u3068\u3088\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">Q. \u4e09\u89d2\u5f62\u306b\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u30ab\u30e9\u30fc\u3092\u4ed8\u3051\u3089\u308c\u307e\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">border\u6280\u6cd5\u3067\u306fborder\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306f\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u304c\u9069\u7528\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u4e09\u89d2\u5f62\u306e\u5b9f\u88c5\u306f\u56f0\u96e3\u3067\u3059\u3002clip-path\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u3001\u8981\u7d20\u81ea\u4f53\u306bbackground: linear-gradient()\u3092\u8a2d\u5b9a\u3057\u305f\u4e0a\u3067clip-path\u3067\u304f\u308a\u629c\u3051\u3070\u3001\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u4e09\u89d2\u5f62\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u4e09\u89d2\u5f62 *\/\n.triangle-gradient {\n  width: 120px;\n  height: 100px;\n  background: linear-gradient(135deg, #d16176, #EFBDB7);\n  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">Q. \u4e09\u89d2\u5f62\u306eborder\u306b\u5f71\uff08box-shadow\uff09\u3092\u4ed8\u3051\u3089\u308c\u307e\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">border\u6280\u6cd5\u306e\u4e09\u89d2\u5f62\u306fwidth\u3068height\u304c0\u306a\u306e\u3067\u3001<code>box-shadow<\/code>\u306f\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306b<code>filter: drop-shadow()<\/code>\u3092\u4f7f\u3046\u3068\u5f71\u3092\u4ed8\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002clip-path\u3092\u4f7f\u3063\u305f\u4e09\u89d2\u5f62\u3082\u540c\u69d8\u3067\u3001<code>box-shadow<\/code>\u306f\u304f\u308a\u629c\u3044\u305f\u5f62\u306b\u306f\u8ffd\u5f93\u3057\u307e\u305b\u3093\u304c<code>filter: drop-shadow()<\/code>\u306f\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* drop-shadow\u3067\u4e09\u89d2\u5f62\u306b\u5f71\u3092\u4ed8\u3051\u308b *\/\n.triangle-shadow {\n  width: 0;\n  height: 0;\n  border-left: 40px solid transparent;\n  border-right: 40px solid transparent;\n  border-bottom: 60px solid #d16176;\n  filter: drop-shadow(2px 4px 6px rgba(0,0,0,0.3));\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">Q. \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3067\u4e09\u89d2\u5f62\u306e\u30b5\u30a4\u30ba\u3092\u5909\u3048\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">border\u6280\u6cd5\u306e\u4e09\u89d2\u5f62\u306fpx\u3067\u6307\u5b9a\u3059\u308b\u305f\u3081\u3001\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u5024\u3092\u4e0a\u66f8\u304d\u3059\u308b\u304bvw\u306a\u3069\u306e\u76f8\u5bfe\u5358\u4f4d\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002clip-path\u306f\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u6307\u5b9a\u306a\u306e\u3067\u8981\u7d20\u306ewidth\/height\u3092\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u306b\u5909\u5316\u3055\u305b\u308b\u3060\u3051\u3067\u4e09\u89d2\u5f62\u3082\u81ea\u52d5\u7684\u306b\u30b9\u30b1\u30fc\u30eb\u3057\u307e\u3059\u3002\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3092\u8003\u616e\u3059\u308b\u306a\u3089\u3001clip-path\u306e\u65b9\u304c\u7ba1\u7406\u3057\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067border\u4e09\u89d2\u5f62\u306e\u30b5\u30a4\u30ba\u3092\u8abf\u6574 *\/\n.triangle-responsive {\n  width: 0;\n  height: 0;\n  border-left: 40px solid transparent;\n  border-right: 40px solid transparent;\n  border-bottom: 60px solid #d16176;\n}\n\n@media (max-width: 640px) {\n  .triangle-responsive {\n    border-left-width: 25px;\n    border-right-width: 25px;\n    border-bottom-width: 40px;\n  }\n}<\/code><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">Q. \u5439\u304d\u51fa\u3057\u306e\u4e09\u89d2\u5f62\uff08\u3057\u3063\u307d\uff09\u306e\u4f4d\u7f6e\u3092\u5de6\u7aef\u3084\u53f3\u7aef\u306b\u5bc4\u305b\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u7591\u4f3c\u8981\u7d20\u306e<code>left<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u3060\u3051\u3067\u3059\u3002\u4e2d\u592e\u306b\u5bc4\u305b\u308b\u5834\u5408\u306f<code>left: 50%; transform: translateX(-50%)<\/code>\u3001\u5de6\u7aef\u306b\u5bc4\u305b\u308b\u5834\u5408\u306f<code>left: 20px<\/code>\uff08\u56fa\u5b9a\u5024\uff09\u3001\u53f3\u7aef\u306b\u5bc4\u305b\u308b\u5834\u5408\u306f<code>right: 20px<\/code>\u3068\u6307\u5b9a\u3057\u307e\u3059\u3002<code>transform<\/code>\u3092\u5916\u3057\u3066<code>left<\/code>\u304b<code>right<\/code>\u306b\u76f4\u63a5px\u5024\u3092\u6307\u5b9a\u3059\u308c\u3070\u3001\u4efb\u610f\u306e\u4f4d\u7f6e\u306b\u914d\u7f6e\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u3057\u3063\u307d\u3092\u5de6\u7aef\u306b\u5bc4\u305b\u308b\u4f8b *\/\n.balloon-left-tail::after {\n  content: \"\";\n  position: absolute;\n  bottom: -20px;\n  left: 20px;   \/* \u2190 \u5de6\u7aef\u304b\u308920px\u306e\u4f4d\u7f6e *\/\n  width: 0;\n  height: 0;\n  border-left: 12px solid transparent;\n  border-right: 12px solid transparent;\n  border-top: 20px solid #EFBDB7;\n}<\/code><\/pre><\/div>\n\n\n\n<!-- withmedia-related -->\n\n\n\n<!-- withmedia-faq-schema -->\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"border\u6280\u6cd5\u3068clip-path\u306f\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\u3067\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"\u7528\u9014\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u306e\u304c\u30d9\u30b9\u30c8\u3067\u3059\u3002border\u6280\u6cd5\u306f\u53e4\u304f\u304b\u3089\u3042\u308b\u624b\u6cd5\u3067\u30d6\u30e9\u30a6\u30b6\u4e92\u63db\u6027\u304c\u975e\u5e38\u306b\u9ad8\u304f\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u4e0a\u4e0b\u5de6\u53f3\u306e\u4e09\u89d2\u5f62\u30fb\u5439\u304d\u51fa\u3057\u306e\u3057\u3063\u307d\u306b\u5411\u3044\u3066\u3044\u307e\u3059\u3002\u8981\u7d20\u306ewidth\/height\u304c0\u306b\u306a\u308b\u70b9\u3092\u7406\u89e3\u3057\u3066\u3044\u308c\u3070\u76f4\u611f\u7684\u306b\u4f7f\u3048\u307e\u3059\u3002clip-path\u306f\u4efb\u610f\u306e\u5ea7\u6a19\u6307\u5b9a\u304c\u3067\u304d\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5bfe\u5fdc\u30fb\u8981\u7d20\u306b\u5e45\u3068\u9ad8\u3055\u3092\u6301\u305f\u305b\u305f\u307e\u307e\u304f\u308a\u629c\u3051\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u30022026\u5e74\u73fe\u5728\u306f\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u5168\u5bfe\u5fdc\u306a\u306e\u3067\u3001\u65b0\u898f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306fclip-path\u3092\u7a4d\u6975\u7684\u306b\u63a1\u7528\u3059\u308b\u3068\u3088\u3044\u3067\u3057\u3087\u3046\u3002\"}}, {\"@type\": \"Question\", \"name\": \"\u4e09\u89d2\u5f62\u306b\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u30ab\u30e9\u30fc\u3092\u4ed8\u3051\u3089\u308c\u307e\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"border\u6280\u6cd5\u3067\u306fborder\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306f\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u304c\u9069\u7528\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u4e09\u89d2\u5f62\u306e\u5b9f\u88c5\u306f\u56f0\u96e3\u3067\u3059\u3002clip-path\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u3001\u8981\u7d20\u81ea\u4f53\u306bbackground: linear-gradient()\u3092\u8a2d\u5b9a\u3057\u305f\u4e0a\u3067clip-path\u3067\u304f\u308a\u629c\u3051\u3070\u3001\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u4e09\u89d2\u5f62\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\"}}, {\"@type\": \"Question\", \"name\": \"\u4e09\u89d2\u5f62\u306eborder\u306b\u5f71\uff08box-shadow\uff09\u3092\u4ed8\u3051\u3089\u308c\u307e\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"border\u6280\u6cd5\u306e\u4e09\u89d2\u5f62\u306fwidth\u3068height\u304c0\u306a\u306e\u3067\u3001box-shadow\u306f\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306bfilter: drop-shadow()\u3092\u4f7f\u3046\u3068\u5f71\u3092\u4ed8\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002clip-path\u3092\u4f7f\u3063\u305f\u4e09\u89d2\u5f62\u3082\u540c\u69d8\u3067\u3001box-shadow\u306f\u304f\u308a\u629c\u3044\u305f\u5f62\u306b\u306f\u8ffd\u5f93\u3057\u307e\u305b\u3093\u304cfilter: drop-shadow()\u306f\u6709\u52b9\u3067\u3059\u3002\"}}, {\"@type\": \"Question\", \"name\": \"\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3067\u4e09\u89d2\u5f62\u306e\u30b5\u30a4\u30ba\u3092\u5909\u3048\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"border\u6280\u6cd5\u306e\u4e09\u89d2\u5f62\u306fpx\u3067\u6307\u5b9a\u3059\u308b\u305f\u3081\u3001\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u5024\u3092\u4e0a\u66f8\u304d\u3059\u308b\u304bvw\u306a\u3069\u306e\u76f8\u5bfe\u5358\u4f4d\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002clip-path\u306f\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u6307\u5b9a\u306a\u306e\u3067\u8981\u7d20\u306ewidth\/height\u3092\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u306b\u5909\u5316\u3055\u305b\u308b\u3060\u3051\u3067\u4e09\u89d2\u5f62\u3082\u81ea\u52d5\u7684\u306b\u30b9\u30b1\u30fc\u30eb\u3057\u307e\u3059\u3002\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3092\u8003\u616e\u3059\u308b\u306a\u3089\u3001clip-path\u306e\u65b9\u304c\u7ba1\u7406\u3057\u3084\u3059\u3044\u3067\u3059\u3002\"}}, {\"@type\": \"Question\", \"name\": 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href=\"https:\/\/withcode.tech\/media\/css-modern-ui-components-30\/\">\u3010\u30b3\u30d4\u30da\u53ef\u3011CSS\u3060\u3051\u3067\u4f5c\u308b\u30e2\u30c0\u30f3UI\u30d1\u30fc\u30c430\u9078\uff5c\u5b9f\u88c5\u30b3\u30fc\u30c9\u5168\u90e8\u8f09\u305b<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/css-button-design-hover\/\">CSS\u30dc\u30bf\u30f3\u30c7\u30b6\u30a4\u30f330\u9078\uff5c\u30b3\u30d4\u30da\u3067\u4f7f\u3048\u308b\u304a\u3057\u3083\u308c\u306a\u30db\u30d0\u30fc\u30a8\u30d5\u30a7\u30af\u30c8\u96c6<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/css-color-change\/\">HTML\u3068CSS\u3067\u6587\u5b57\u8272\u3092\u5909\u3048\u308b\u65b9\u6cd5\uff5c\u521d\u5fc3\u8005\u5411\u3051\u5b8c\u5168\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/css-loading-animation\/\">CSS\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u96c6\uff5c\u30b3\u30d4\u30da\u3067\u5373\u4f7f\u3048\u308b\u5b9f\u88c5\u30b5\u30f3\u30d7\u30eb20<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/css-absolute-relative\/\">CSS\u306eposition absolute\/relative\u5b8c\u5168\u30ac\u30a4\u30c9\u30102026\u5e74\u7248\u3011<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">CSS\u30fbWeb\u30c7\u30b6\u30a4\u30f3\u5b9f\u88c5\u306e\u7dcf\u307e\u3068\u3081<\/h2><!-- vizmedia-batch34-quality:start:css-triangle-10 --><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-10.jpg\" alt=\"CSS\u30fbWeb\u30c7\u30b6\u30a4\u30f3\u5b9f\u88c5\u306e\u7dcf\u307e\u3068\u3081\" class=\"wp-image-24470\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-10.jpg 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-10-768x432.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/09\/css-triangle-quality-v2-h2-10-1536x864.jpg 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n<!-- vizmedia-batch34-quality:end:css-triangle-10 -->\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u3092\u300c\u30ec\u30a4\u30a2\u30a6\u30c8\u30fb\u88c5\u98fe\u30fb\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u30fb\u57fa\u790e\u30fb\u30c8\u30e9\u30d6\u30eb\u89e3\u6c7a\u300d\u306e\u76ee\u7684\u5225\u306b\u63a2\u305b\u308b\u7dcf\u307e\u3068\u3081\u30da\u30fc\u30b8\u3092\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u88c5\u3067\u8ff7\u3063\u305f\u3068\u304d\u306e\u7d22\u5f15\u3068\u3057\u3066\u3069\u3046\u305e\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/withcode.tech\/media\/css-webdesign-technique-map\/\">\u3010CSS\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u5b8c\u5168\u30de\u30c3\u30d7\u3011\u30b3\u30d4\u30da\u3067\u4f7f\u3048\u308bWeb\u30c7\u30b6\u30a4\u30f3\u5b9f\u88c5\u30ac\u30a4\u30c9\u7dcf\u307e\u3068\u3081<\/a><\/li>\n<\/ul>\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 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