{"id":1616,"date":"2025-11-29T20:52:36","date_gmt":"2025-11-29T11:52:36","guid":{"rendered":"https:\/\/ownmono.com\/blog\/?p=1616"},"modified":"2025-12-11T20:19:56","modified_gmt":"2025-12-11T11:19:56","slug":"css-heading-decoration-pseudo-elements","status":"publish","type":"post","link":"https:\/\/ownmono.com\/blog\/frontend\/css-heading-decoration-pseudo-elements\/","title":{"rendered":"CSS\u3060\u3051\u3067\u898b\u51fa\u3057\u3092\u304a\u3057\u3083\u308c\u306b\u88c5\u98fe\u3059\u308b\u65b9\u6cd5\uff5c\u64ec\u4f3c\u8981\u7d20\u3068\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u307e\u3067\u89e3\u8aac"},"content":{"rendered":"<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/ownmono.com\/blog\/wp-content\/uploads\/2024\/03\/hashibi_right-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30cf\u30b7\u30d3\u30a3\u304f\u3093<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u30bf\u30a4\u30c8\u30eb\u304c\u30b7\u30f3\u30d7\u30eb\u306a\u30c7\u30b6\u30a4\u30f3\u3059\u304e\u3066\u88c5\u98fe\u3057\u3066\u3001\u76ee\u7acb\u305f\u305b\u308b\u5de5\u592b\u304c\u3057\u305f\u3044\u3063\u3059\uff01<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"yellow\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/ownmono.com\/blog\/wp-content\/uploads\/2024\/03\/capy_left-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30ab\u30d4\u30fc\u3055\u3093<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u305d\u308c\u306a\u3089\u64ec\u4f3c\u8981\u7d20\u3092\u4f7f\u3063\u3066\u307f\u308b\u306e\u304c\u3044\u3044\u3060\u308d\u3046\u3002\u5de5\u592b\u6b21\u7b2c\u3067\u8272\u3005\u3067\u304d\u308b\u304b\u3089\u899a\u3048\u3066\u304a\u304f\u3068\u3044\u3044\u305e\u3002<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">\uff3c\u898b\u51fa\u3057\u90e8\u5206\uff0f\u3092\u4f5c\u3063\u3066\u307f\u308b<\/h2>\n\n\n\n<p>\u898b\u51fa\u3057\u90e8\u5206\u3092\u88c5\u98fe\u3057\u3066\u307f\u305f\u5b8c\u6210\u7cfb\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u57fa\u672c\u5f62\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"codepen\" data-height=\"300\" data-default-tab=\"html,result\" data-slug-hash=\"dPMKGdd\" data-pen-title=\"Untitled\" data-user=\"honky-the-typescripter\" style=\"height: 300px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid; margin: 1em 0; padding: 1em;\">\n      <span>See the Pen <a href=\"https:\/\/codepen.io\/honky-the-typescripter\/pen\/dPMKGdd\">\n  Untitled<\/a> by honky (<a href=\"https:\/\/codepen.io\/honky-the-typescripter\">@honky-the-typescripter<\/a>)\n  on <a href=\"https:\/\/codepen.io\">CodePen<\/a>.<\/span>\n      <\/p>\n      <script async src=\"https:\/\/public.codepenassets.com\/embed\/index.js\"><\/script>\n\n\n\n<p>\u307e\u305a\u306f\u57fa\u672c\u3068\u306a\u308bHTML\u90e8\u5206\u3092\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;h1&gt;\u898b\u51fa\u3057\u30bf\u30a4\u30c8\u30eb&lt;\/h1&gt;<\/code><\/pre><\/div>\n\n\n\n<p>\u305d\u3057\u3066\u6b21\u306f\u6839\u5e79\u306eCSS\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002\u30b3\u30d4\u30da\u5f8c\u306b\u6539\u4fee\u3057\u3066\u3044\u305f\u3060\u304f\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u3042\u304f\u307e\u3067\u30d9\u30fc\u30b9\u3068\u6349\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>body {\n  text-align: center;\n}\n\nh1 {\n  display: inline-block;\n  position: relative;\n  font-size: 24px;\n  color: #000;\n  padding: 0 20px; \/* \u4f59\u767d\u3092\u3057\u3063\u304b\u308a\u78ba\u4fdd\u3057\u3066\u91cd\u306a\u308a\u3092\u9632\u3050 *\/\n}\n\n\/* \u5171\u901a\u30b9\u30bf\u30a4\u30eb *\/\nh1::before,\nh1::after {\n  content: &quot;&quot;;\n  position: absolute;\n  background: #000;\n  width: 30px;\n  height: 2px;\n  top: 50%;\n  transform: translateY(-50%);\n}\n\n\/* \u5de6\u306e\u659c\u7dda *\/\nh1::before {\n  left: -40px;\n  transform: translateY(-50%) rotate(45deg);\n}\n\n\/* \u53f3\u306e\u659c\u7dda *\/\nh1::after {\n  right: -40px;\n  transform: translateY(-50%) rotate(-45deg);\n}\n\n\/* --- \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u7248 --- *\/\n\n\/* \u30b9\u30de\u30db\uff08\u5e45 480px \u4ee5\u4e0b\uff09*\/\n@media (max-width: 480px) {\n  h1 {\n    font-size: 20px;\n  }\n  h1::before,\n  h1::after {\n    width: 20px;\n  }\n  h1::before {\n    left: -28px;\n  }\n  h1::after {\n    right: -28px;\n  }\n}\n\n\/* \u30bf\u30d6\u30ec\u30c3\u30c8\uff08\u5e45 768px \u4ee5\u4e0b\uff09*\/\n@media (max-width: 768px) {\n  h1 {\n    font-size: 22px;\n  }\n  h1::before,\n  h1::after {\n    width: 26px;\n  }\n  h1::before {\n    left: -34px;\n  }\n  h1::after {\n    right: -34px;\n  }\n}\n<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u30b9\u30bf\u30a4\u30eb\u3067\u306f\u3001<code>h1<\/code> \u8981\u7d20\u306e\u5de6\u53f3\u306b\u7591\u4f3c\u8981\u7d20 <code>::before<\/code> \u3068 <code>::after<\/code> \u3092\u4f7f\u3063\u3066\u659c\u3081\u306e\u7dda\u3092\u914d\u7f6e\u3057\u3001\u898b\u51fa\u3057\u3092\u88c5\u98fe\u3057\u3066\u3044\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u69cb\u9020\u306f\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3088\u308a\u5b89\u5b9a\u3057\u305f\u8868\u793a\u306b\u3059\u308b\u305f\u3081\u306b\u3044\u304f\u3064\u304b\u6539\u5584\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u3001\u7591\u4f3c\u8981\u7d20\u306e\u7e26\u4f4d\u7f6e\u3092 <code>top: 50%<\/code> \u3068 <code>transform: translateY(-50%)<\/code> \u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3059\u308b\u3068\u3001\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u304c\u5909\u308f\u3063\u305f\u5834\u5408\u3067\u3082\u88c5\u98fe\u306e\u4f4d\u7f6e\u304c\u305a\u308c\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001<code>h1<\/code> \u672c\u4f53\u306b\u5de6\u53f3\u306e\u4f59\u767d\u3092\u9069\u5ea6\u306b\u6301\u305f\u305b\u308b\u3053\u3068\u3067\u3001\u6587\u5b57\u3068\u88c5\u98fe\u304c\u91cd\u306a\u308b\u306e\u3092\u9632\u304e\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3055\u3089\u306b\u3001\u753b\u9762\u5e45\u304c\u72ed\u3044\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3084\u30bf\u30d6\u30ec\u30c3\u30c8\u3067\u306f\u3001\u6587\u5b57\u30b5\u30a4\u30ba\u3084\u659c\u7dda\u306e\u9577\u3055\u304c\u305d\u306e\u307e\u307e\u3060\u3068\u30d0\u30e9\u30f3\u30b9\u304c\u5d29\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3063\u3066\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3084\u659c\u7dda\u306e\u9577\u3055\u3001\u4f4d\u7f6e\u3092\u5c0f\u3055\u304f\u8abf\u6574\u3057\u3001\u3069\u306e\u753b\u9762\u5e45\u3067\u3082\u898b\u3084\u3059\u3044\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u7591\u4f3c\u8981\u7d20\u306e\u57fa\u672c\u69cb\u9020\u306f\u305d\u306e\u307e\u307e\u6d3b\u304b\u3057\u3064\u3064\u3001\u4f4d\u7f6e\u8abf\u6574\u3068\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u3088\u308a\u6c4e\u7528\u6027\u304c\u9ad8\u304f\u5b89\u5b9a\u3057\u305f\u898b\u51fa\u3057\u88c5\u98fe\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081\uff1aCSS\u3060\u3051\u3067\u898b\u51fa\u3057\u3092\u304a\u3057\u3083\u308c\u306b\u88c5\u98fe\u3059\u308b\u65b9\u6cd5\uff5c\u64ec\u4f3c\u8981\u7d20\u3068\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u307e\u3067\u89e3\u8aac<\/h2>\n\n\n\n<p>CSS \u306e\u64ec\u4f3c\u8981\u7d20\u3092\u4f7f\u3048\u3070\u3001\u753b\u50cf\u3092\u4f7f\u308f\u305a\u306b\u898b\u51fa\u3057\u3092\u304a\u3057\u3083\u308c\u306b\u88c5\u98fe\u3067\u304d\u307e\u3059\u3002::before \u3068 ::after \u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3060\u3051\u3067\u3001\u8efd\u91cf\u3067\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u306e\u9ad8\u3044\u30c7\u30b6\u30a4\u30f3\u3092\u5b9f\u73fe\u3067\u304d\u308b\u306e\u304c\u9b45\u529b\u3067\u3059\u3002\u3055\u3089\u306b\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u306e\u66f8\u304d\u65b9\u3092\u53d6\u308a\u5165\u308c\u308b\u3053\u3068\u3067\u3001PC\u30fb\u30b9\u30de\u30db\u3069\u3061\u3089\u3067\u3082\u5d29\u308c\u306b\u304f\u3044\u898b\u51fa\u3057\u304c\u4f5c\u308c\u307e\u3059\u3002\u8a18\u4e8b\u5185\u306e\u30b3\u30fc\u30c9\u3092\u53c2\u8003\u306b\u3001\u3042\u306a\u305f\u306e\u30b5\u30a4\u30c8\u306b\u5408\u3063\u305f\u898b\u305f\u76ee\u3078\u30a2\u30ec\u30f3\u30b8\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span><strong>CSS\u3060\u3051\u3067\u898b\u51fa\u3057\u3092\u304a\u3057\u3083\u308c\u306b\u88c5\u98fe\u3059\u308b\u65b9\u6cd5\uff5c\u64ec\u4f3c\u8981\u7d20\u3068\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u307e\u3067\u89e3\u8aac<\/strong><\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li><strong>\u64ec\u4f3c\u8981\u7d20\uff08::before \/ ::after\uff09\u3067\u753b\u50cf\u306a\u3057\u306e\u8efd\u91cf\u306a\u88c5\u98fe\u304c\u53ef\u80fd<\/strong><\/li>\n\n\n\n<li><strong>\u4f4d\u7f6e\u30fb\u89d2\u5ea6\u30fb\u9577\u3055\u3092\u8abf\u6574\u3059\u308b\u3060\u3051\u3067\u81ea\u7531\u306b\u30c7\u30b6\u30a4\u30f3\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u308b<\/strong><\/li>\n\n\n\n<li><strong>\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3092\u52a0\u3048\u308b\u3053\u3068\u3067\u3001\u3069\u306e\u753b\u9762\u5e45\u3067\u3082\u7f8e\u3057\u304f\u8868\u793a\u3067\u304d\u308b<\/strong><\/li>\n<\/ul>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\uff3c\u898b\u51fa\u3057\u90e8\u5206\uff0f\u3092\u4f5c\u3063\u3066\u307f\u308b \u898b\u51fa\u3057\u90e8\u5206\u3092\u88c5\u98fe\u3057\u3066\u307f\u305f\u5b8c\u6210\u7cfb\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u57fa\u672c\u5f62\u3067\u3059\u3002 See the Pen Untitled by honky (@honky-the-typescripter) on Cod [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1622,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[19],"tags":[14,8],"class_list":["post-1616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-frontend","tag-css","tag-beginner"],"_links":{"self":[{"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/posts\/1616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/comments?post=1616"}],"version-history":[{"count":2,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/posts\/1616\/revisions"}],"predecessor-version":[{"id":1618,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/posts\/1616\/revisions\/1618"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/media\/1622"}],"wp:attachment":[{"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/media?parent=1616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/categories?post=1616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ownmono.com\/blog\/wp-json\/wp\/v2\/tags?post=1616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}