{"id":55061,"date":"2018-05-29T10:46:06","date_gmt":"2018-05-29T01:46:06","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=55061"},"modified":"2024-05-06T11:47:56","modified_gmt":"2024-05-06T02:47:56","slug":"%e3%80%90css%e3%80%91%e8%a6%81%e7%b4%a0%e3%81%ae%e9%87%8d%e3%81%aa%e3%82%8a%e3%82%92%e8%87%aa%e7%94%b1%e3%81%ab%e8%aa%bf%e6%95%b4-z-index%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/55061","title":{"rendered":"CSS\u306ez-index\u3067\u8981\u7d20\u306e\u91cd\u306a\u308a\u3092\u81ea\u7531\u306b\u8abf\u6574\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30e9\u30a4\u30bf\u30fc\u306e\u30ca\u30ca\u30df\u3067\u3059\u3002<\/p>\n<p>WEB\u30b5\u30a4\u30c8\u3092\u4f5c\u3063\u3066\u3044\u3066\u3001\u8981\u7d20\u306e\u91cd\u306a\u308a\u9806\u3092\u5909\u3048\u305f\u3044\u6642\u3063\u3066\u3042\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n<p><div class=\"box_voice\">\u3053\u306e\u753b\u50cf\u306f\u524d\u306b\u51fa\u3057\u305f\u3044<br \/>\n\u9006\u306b\u5f8c\u308d\u306b\u6301\u3063\u3066\u3044\u304d\u305f\u3044<\/div><\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u4eca\u56de\u306f\u8981\u7d20\u306e\u91cd\u306a\u308a\u3092\u8abf\u6574\u3067\u304d\u308bz-index\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\uff01\u3053\u306e\u8a18\u4e8b\u306f\u4e0b\u8a18\u306e\u6d41\u308c\u3067\u89e3\u8aac\u3092\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u3010\u57fa\u790e\u3011z-index\u3068\u306f\u4f55\u304b<\/b><\/li>\n<li><b>\u3010\u57fa\u790e\u3011z-index\u306e\u4f7f\u3044\u65b9<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011z-index\u304c\u52b9\u304b\u306a\u3044\u6642\u306e\u5bfe\u51e6\u6cd5<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011z-index\u306e\u4f7f\u7528\u4f8b<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u8981\u7d20\u306e\u91cd\u306a\u308a\u3092\u8abf\u6574\u3067\u304d\u308c\u3070\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306f\u81ea\u7531\u81ea\u5728\uff01\u3057\u3063\u304b\u308a\u899a\u3048\u3066\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u5e45\u3092\u5e83\u3052\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>z-index\u3068\u306f\uff1f<\/h2>\n<p>z-index\u306f<b>\u8981\u7d20\u306e\u91cd\u306a\u308a\u3092\u6c7a\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30d7\u30ed\u30d1\u30c6\u30a3<\/b>\u3067\u3059\u3002<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55066\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex0.jpg\" alt=\"zindex0\" width=\"599\" height=\"334\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex0.jpg 599w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex0-150x84.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex0-300x167.jpg 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/p>\n<p>\u7d19\u3092\u91cd\u306d\u308b\u3068\u4e0b\u306e\u7d19\u306f\u4e0a\u306e\u7d19\u306b\u96a0\u308c\u3066\u898b\u3048\u306a\u304f\u306a\u308a\u307e\u3059\u3088\u306d\u3002WEB\u30b5\u30a4\u30c8\u306e\u8981\u7d20\u3082\u540c\u69d8\u306b\u3001\u91cd\u306a\u308a\u304c\u4e0a\u306e\u3082\u306e\u304c\u898b\u3048\u3066\u3044\u308b\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55067\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1.jpg\" alt=\"zindex1\" width=\"320\" height=\"291\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1.jpg 320w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1-150x136.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1-300x273.jpg 300w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/p>\n<p>\u3053\u306e\u91cd\u306a\u3063\u3066\u3044\u308b\u9806\u756a\u3092\u5165\u308c\u66ff\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u304c\u3001z-index\u3067\u3059\u3002<\/p>\n<h3>\u6570\u5024\u306e\u5927\u304d\u3055\u3067\u91cd\u306a\u308a\u9806\u304c\u6c7a\u307e\u308b<\/h3>\n<p>z-index\u306f\u6570\u5024\u3067\u6307\u5b9a\u3092\u3057\u307e\u3059\u3002\u3053\u306e\u6570\u5024\u304c\u5927\u304d\u3051\u308c\u3070\u624b\u524d\u306b\u3001\u5c0f\u3055\u3051\u308c\u3070\u5f8c\u308d\u306b\u8981\u7d20\u3092\u914d\u7f6e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u624b\u524d\u3084\u5f8c\u308d\u306b\u306a\u308b\u6570\u5024\u304c\u6c7a\u307e\u3063\u3066\u3044\u308b\u8a33\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u6570\u5024\u306b\u6bd4\u3079\u3066\u3053\u3061\u3089\u306e\u65b9\u304c\u5927\u304d\u3044\u304b\u3089\u3068\u3044\u3046\u6bd4\u8f03\u306b\u3088\u308b\u9806\u5e8f\u3065\u3051\u304c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55068\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex2.jpg\" alt=\"zindex2\" width=\"320\" height=\"291\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex2.jpg 320w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex2-150x136.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex2-300x273.jpg 300w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/p>\n<p>\u8d64\u3044\u7bb1\u306fz-index\u306e\u6570\u5024\u309210\u306b\u3001\u9752\u3044\u7bb1\u306f100\u306b\u3057\u307e\u3057\u305f\u3002\u9752\u3044\u7bb1\u306e\u65b9\u304cz-index\u306e\u6570\u5024\u304c\u5927\u304d\u3044\u306e\u3067\u3001\u624b\u524d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u9752\u3044\u7bb1\u306ez-index\u306e\u6570\u5024\u30925\u306b\u5909\u66f4\u3057\u3066\u307f\u308b\u3068\u2026<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55069\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex3.jpg\" alt=\"zindex3\" width=\"313\" height=\"289\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex3.jpg 313w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex3-150x138.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex3-300x277.jpg 300w\" sizes=\"(max-width: 313px) 100vw, 313px\" \/><\/p>\n<p>\u8d64\u3044\u7bb1\u306e\u65b9\u304cz-index\u306e\u6570\u5024\u304c\u5927\u304d\u304f\u306a\u308b\u306e\u3067\u3001\u8d64\u3044\u7bb1\u304c\u624b\u524d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>position\u3092\u6307\u5b9a\u3057\u3066\u3044\u306a\u3044\u3068\u30c0\u30e1\uff01<\/h3>\n<p>z-index\u306fposition\u3092\u6307\u5b9a\u3057\u3066\u3044\u306a\u3044\u3068\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3082<b>position:static\u4ee5\u5916\u3001relative\u3001absolute\u3001fixed\u304c\u6307\u5b9a<\/b>\u3055\u308c\u3066\u3044\u308b\u8981\u7d20\u306b\u3057\u304b\u4f7f\u3048\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p><b>z-index\u306fposition\u3068\u30bb\u30c3\u30c8\u3002\u3053\u308c\u306f\u304b\u306a\u308a\u91cd\u8981<\/b>\u306a\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6<\/h3>\n<p>z-index\u306f\u30aa\u30fc\u30eb\u30c9\u30d6\u30e9\u30a6\u30b6\u3082\u542b\u3081\u3066\u3001\u5168\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u554f\u984c\u306a\u304f\u52d5\u4f5c\u3057\u307e\u3059\u3002\u5b89\u5fc3\u3057\u3066\u4f7f\u3063\u3061\u3083\u3044\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>z-index\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>z-index\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<p>CSS<\/p>\n<pre class=\"lang:css decode:true \">\u30bb\u30ec\u30af\u30bf {\r\n    z-index: \u6570\u5024;\r\n}\r\n<\/pre>\n<p>\u6570\u5024\u306e\u90e8\u5206\u3067\u91cd\u306a\u308a\u9806\u3092\u6c7a\u3081\u3066\u3044\u307e\u3059\u3002<b>\u5927\u304d\u3051\u308c\u3070\u524d\u9762\u306b\u51fa\u3084\u3059\u304f\u3001\u5c0f\u3055\u3051\u308c\u3070\u5f8c\u308d\u306b\u884c\u304d\u3084\u3059\u3044<\/b>\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u6570\u5024\u306f\u30de\u30a4\u30ca\u30b9\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u52d5\u4f5c\u306f\u30d7\u30e9\u30b9\u306e\u5024\u3068\u540c\u3058\u306a\u306e\u3067\u3001\u6307\u5b9a\u3067\u304d\u308b\u6570\u5024\u306e\u5e45\u304c\u5e83\u3044\u3068\u601d\u3063\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u5927\u4e08\u592b\u3067\u3059\u3002\u5b9f\u969b\u306b\u4f7f\u3063\u3066\u307f\u308b\u3068\u2026<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55067\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1.jpg\" alt=\"zindex1\" width=\"320\" height=\"291\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1.jpg 320w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1-150x136.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex1-300x273.jpg 300w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/p>\n<p>HTML<\/p>\n<pre class=\"decode:true \">&lt;div class=\"z-index_test\"&gt;\r\n&lt;\/div&gt;\r\n&lt;div class=\"z-index_test2\"&gt;\r\n&lt;\/div&gt;\r\n<\/pre>\n<p>CSS<\/p>\n<pre class=\"lang:css decode:true \">.z-index_test {\r\n    height:  200px;             \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n    width:  200px;              \/* \u5e45\u6307\u5b9a *\/\r\n    background-color: #FF5722;  \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    position:  relative;        \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    z-index: 10;                \/* \u91cd\u306a\u308a\u9806\u6307\u5b9a *\/\r\n}\r\n.z-index_test2 {\r\n    height:  200px;             \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n    width:  200px;              \/* \u5e45\u6307\u5b9a *\/\r\n    background-color: #03A9F4;  \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    position:  absolute;        \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    top: 70px;                  \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    left: 100px;                \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    z-index: 100;               \/* \u91cd\u306a\u308a\u9806\u6307\u5b9a *\/\r\n}\r\n<\/pre>\n<p>\u3053\u3093\u306a\u611f\u3058\u3067\u3001\u91cd\u306a\u308a\u9806\u3092\u6c7a\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>z-index\u304c\u52b9\u304b\u306a\u3044\u6642\u306e\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8<\/h2>\n<p><div class=\"box_voice\">\u66f8\u3044\u3066\u3042\u308b\u901a\u308a\u306b\u5b9f\u88c5\u3057\u305f\u306e\u306b\u3001\u3061\u3083\u3093\u3068\u91cd\u306a\u308a\u9806\u306e\u8abf\u6574\u304c\u3067\u304d\u306a\u3044\u2026<\/div><\/p>\n<p>\u305d\u3093\u306a\u6642\u306b\u306f\u3001\u4e0b\u8a18\u306e2\u70b9\u3092\u518d\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>position\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u304b<\/h3>\n<p>\u524d\u8ff0\u306e\u901a\u308a\u3001<b>z-index\u306fposition:static\u4ee5\u5916\u306eposition\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6307\u5b9a<\/b>\u3057\u3066\u3044\u306a\u3044\u3068\u52d5\u4f5c\u3057\u307e\u305b\u3093\u3002\u91cd\u306a\u308a\u3092\u5909\u66f4\u3057\u305f\u3044\u8981\u7d20\u306b\u3001\u304d\u3061\u3093\u3068position\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u524d\u306b\u51fa\u3057\u305f\u3044\u3082\u306e\u306e\u6570\u5024\u306e\u65b9\u304c\u5927\u304d\u3044\u304b<\/h3>\n<p>z-index\u306f\u6307\u5b9a\u3057\u305f\u6570\u5024\u304c\u5927\u304d\u3044\u3082\u306e\u3092\u624b\u524d\u306b\u914d\u7f6e\u3057\u307e\u3059\u3002\u5f8c\u308d\u306b\u914d\u7f6e\u3057\u305f\u3044\u8981\u7d20\u3068\u624b\u524d\u306b\u51fa\u3057\u305f\u3044\u8981\u7d20\u3001<b>\u305d\u308c\u305e\u308c\u306ez-index\u306e\u6570\u5024\u3092\u78ba\u8a8d<\/b>\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u624b\u524d\u306b\u51fa\u3057\u305f\u3044\u8981\u7d20\u306e\u65b9\u304c\u6570\u5024\u304c\u5c0f\u3055\u304b\u3063\u305f\u3089\u3001\u6570\u5024\u3092\u5927\u304d\u304f\u3059\u308c\u3070\u89e3\u6c7a\u3067\u3059\u3002<\/p>\n<h2>z-index\u306e\u4f7f\u7528\u4f8b<\/h2>\n<p>z-index\u306fposition\u3068\u30bb\u30c3\u30c8\u306a\u3060\u3051\u3042\u3063\u3066\u3001\u3068\u3093\u3067\u3082\u306a\u304f\u76f8\u6027\u304c\u3044\u3044\u3067\u3059\u3002\u3053\u308c\u3089\u3092\u4f7f\u3044\u3053\u306a\u305b\u3070\u3001WEB\u30b5\u30a4\u30c8\u3067\u8272\u3005\u306a\u898b\u305b\u65b9\u304c\u3067\u304d\u307e\u3059\u3002\u4e00\u4f8b\u3092\u6319\u3052\u3066\u307f\u307e\u3057\u305f\u306e\u3067\u3001\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u56fa\u5b9a\u30d8\u30c3\u30c0\u30fc\u3092\u5e38\u306b\u6700\u524d\u9762\u306b<\/h3>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55063\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex1.gif\" alt=\"zindex-ex1\" width=\"640\" height=\"480\" \/><\/p>\n<p>HTML<\/p>\n<pre class=\"decode:true \">&lt;header class=\"z-index_test\"&gt;\r\n    &lt;nav&gt;\r\n        &lt;ul&gt;\r\n            &lt;li&gt;&lt;a href=\"URL\"&gt;\u30e1\u30cb\u30e5\u30fc1&lt;\/a&gt;&lt;\/li&gt;\r\n            &lt;li&gt;&lt;a href=\"URL\"&gt;\u30e1\u30cb\u30e5\u30fc2&lt;\/a&gt;&lt;\/li&gt;\r\n            &lt;li&gt;&lt;a href=\"URL\"&gt;\u30e1\u30cb\u30e5\u30fc3&lt;\/a&gt;&lt;\/li&gt;\r\n            &lt;li&gt;&lt;a href=\"URL\"&gt;\u30e1\u30cb\u30e5\u30fc4&lt;\/a&gt;&lt;\/li&gt;\r\n        &lt;\/ul&gt;\r\n    &lt;\/nav&gt;\r\n&lt;\/header&gt;\r\n&lt;main&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"dummy\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\u3067\u3059\r\n    &lt;\/div&gt;\r\n&lt;\/main&gt;\r\n<\/pre>\n<p>CSS<\/p>\n<pre class=\"lang:css decode:true \">main {\r\n    padding: 90px 20px;                         \/* \u4f59\u767d\u6307\u5b9a *\/\r\n    height: 896px;                              \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n}\r\n.z-index_test {\r\n    background-color: rgba(255, 255, 255, 0.8); \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    z-index: 9999;                              \/* \u91cd\u306a\u308a\u9806\u6307\u5b9a *\/\r\n    text-align: center;                         \/* \u6587\u5b57\u4e2d\u592e\u63c3\u3048 *\/\r\n    position:  fixed;                           \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    width: 100%;                                \/* \u5e45\u6307\u5b9a *\/\r\n    box-sizing:  border-box;                    \/* \u5d29\u308c\u9632\u6b62 *\/\r\n    border-bottom:  solid 1px #ccc;             \/* \u67a0\u7dda\u6307\u5b9a *\/\r\n}\r\n.z-index_test li {\r\n    display:  inline-block;                     \/* \u30a4\u30f3\u30e9\u30a4\u30f3\u30d6\u30ed\u30c3\u30af\u306b\u3059\u308b *\/\r\n    padding: 20px;                              \/* \u4f59\u767d\u6307\u5b9a *\/\r\n}\r\n.z-index_test ul {\r\n    margin:  0;                                 \/* \u30c7\u30d5\u30a9\u30eb\u30c8CSS\u6253\u3061\u6d88\u3057 *\/\r\n    padding: 0;                                 \/* \u30c7\u30d5\u30a9\u30eb\u30c8CSS\u6253\u3061\u6d88\u3057 *\/\r\n}\r\n.z-index_test a {\r\n    color:  #000;                               \/* \u6587\u5b57\u8272\u6307\u5b9a *\/\r\n    text-decoration:  none;                     \/* \u30c7\u30d5\u30a9\u30eb\u30c8CSS\u6253\u3061\u6d88\u3057 *\/\r\n}\r\n.dummy {\r\n    width: 32.3333%;                            \/* \u5e45\u6307\u5b9a *\/\r\n    background-color: #00BCD4;                  \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    display:  inline-block;                     \/* \u30a4\u30f3\u30e9\u30a4\u30f3\u30d6\u30ed\u30c3\u30af\u306b\u3059\u308b *\/\r\n    margin-bottom:  10px;                       \/* \u8981\u7d20\u306e\u7a7a\u304d\u6307\u5b9a *\/\r\n    height: 150px;                              \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n    padding:  10px;                             \/* \u4f59\u767d\u6307\u5b9a *\/\r\n    box-sizing:  border-box;                    \/* \u5d29\u308c\u9632\u6b62 *\/\r\n}\r\n<\/pre>\n<p>\u30d8\u30c3\u30c0\u30fc\u304c\u56fa\u5b9a\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3001\u3059\u3050\u306b\u4ed6\u306e\u30da\u30fc\u30b8\u3078\u79fb\u52d5\u3067\u304d\u3066\u4fbf\u5229\u3067\u3059\u306d\u3002\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u3082\u4ed6\u306e\u8981\u7d20\u3088\u308a\u3082\u524d\u306b\u3042\u308a\u7d9a\u3051\u308b\u3088\u3046\u306b\u3057\u3066\u3042\u3052\u308c\u3070\u5b8c\u74a7\u3067\u3059\u3002<\/p>\n<h3>\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u3089\u8981\u7d20\u306e\u5f8c\u308d\u3078\u96a0\u3059<\/h3>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55064\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex2.gif\" alt=\"zindex-ex2\" width=\"640\" height=\"480\" \/><\/p>\n<p>HTML<\/p>\n<pre class=\"decode:true\">&lt;main&gt;\r\n    &lt;div class=\"z-index_test1\"&gt;\r\n        \u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\r\n    &lt;\/div&gt;\r\n    &lt;div class=\"z-index_test\"&gt;\r\n        \u30b3\u30f3\u30c6\u30f3\u30c4\r\n    &lt;\/div&gt;\r\n&lt;\/main&gt;\r\n<\/pre>\n<p>CSS<\/p>\n<pre class=\"lang:css decode:true\">.z-index_test1 {\r\n    text-align:  center;                \/* \u6587\u5b57\u4e2d\u592e\u63c3\u3048 *\/\r\n    padding:  120px 0;                  \/* \u4f59\u767d\u6307\u5b9a *\/\r\n    background-color: #00BCD4;          \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    color:  #fff;                       \/* \u6587\u5b57\u8272\u6307\u5b9a *\/\r\n    position:  fixed;                   \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    width:  100%;                       \/* \u5e45\u6307\u5b9a *\/\r\n    box-sizing:  border-box;            \/* \u5d29\u308c\u9632\u6b62 *\/\r\n    z-index:  0;                        \/* \u91cd\u306a\u308a\u9806\u6307\u5b9a *\/\r\n    top: 0;                             \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n}\r\n.z-index_test {\r\n    height: 500px;                      \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n    box-shadow: 0px 2px 3px 0px #000;   \/* \u5f71\u6307\u5b9a *\/\r\n    width: 90%;                         \/* \u5e45\u6307\u5b9a *\/\r\n    margin:  0 auto;                    \/* \u8981\u7d20\u4e2d\u592e\u63c3\u3048 *\/\r\n    background-color:  #fff;            \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    position:  relative;                \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    z-index:  9999;                     \/* \u91cd\u306a\u308a\u9806\u6307\u5b9a *\/\r\n    margin-top: 265px;                  \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    padding:  20px;                     \/* \u4f59\u767d\u6307\u5b9a *\/\r\n    box-sizing:  border-box;            \/* \u5d29\u308c\u9632\u6b62 *\/\r\n}\r\nmain {\r\n    height: 600px;                      \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n}\r\n<\/pre>\n<p>\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u3089\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb\u3092\u5f8c\u308d\u306b\u96a0\u3059\u3088\u3046\u306b\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u305f\u3060\u306e\u30b9\u30af\u30ed\u30fc\u30eb\u3088\u308a\u3082\u3061\u3087\u3063\u3068\u9762\u767d\u3044\u52d5\u304d\u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n<h3>\u914d\u7f6e\u305d\u306e\u307e\u307e\u3067\u91cd\u306a\u308a\u3060\u3051\u8abf\u6574<\/h3>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-55065\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex3.jpg\" alt=\"zindex-ex3\" width=\"318\" height=\"222\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex3.jpg 318w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex3-150x105.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex3-300x209.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/zindex-ex3-145x100.jpg 145w\" sizes=\"(max-width: 318px) 100vw, 318px\" \/><\/p>\n<p>HTML<\/p>\n<pre class=\"decode:true\">&lt;div class=\"z-index_test1\"&gt;\r\n    \u8981\u7d20\u306e\u914d\u7f6e\u306f\u305d\u306e\u307e\u307e\u306b\r\n    &lt;div class=\"z-index_test\"&gt;\r\n        \u3053\u3053\u306e\u6587\u5b57\u3060\u3051\u80cc\u9762\u306b\u5165\u308c\u308b\r\n    &lt;\/div&gt;\r\n&lt;\/div&gt;\r\n<\/pre>\n<p>CSS<\/p>\n<pre class=\"lang:css decode:true\">.z-index_test1 {\r\n    width:  300px;                              \/* \u5e45\u6307\u5b9a *\/\r\n    height: 200px;                              \/* \u9ad8\u3055\u6307\u5b9a *\/\r\n    background-color: rgba(3, 169, 244, 0.8);   \/* \u80cc\u666f\u8272\u6307\u5b9a *\/\r\n    padding: 20px;                              \/* \u4f59\u767d\u6307\u5b9a *\/\r\n    box-sizing:  border-box;                    \/* \u5d29\u308c\u9632\u6b62 *\/\r\n    font-size: 20px;                            \/* \u6587\u5b57\u30b5\u30a4\u30ba\u6307\u5b9a *\/\r\n}\r\n\r\n.z-index_test {\r\n    position:  relative;                        \/* \u4f4d\u7f6e\u6307\u5b9a *\/\r\n    z-index:  -1;                               \/* \u91cd\u306a\u308a\u9806\u6307\u5b9a *\/\r\n}\r\n<\/pre>\n<p><div class=\"box_voice\">absolute\u3068\u304b\u3067\u9ad8\u3055\u304c\u306a\u304f\u306a\u308b\u306e\u306f\u56f0\u308b\u3051\u3069\u3001\u91cd\u306a\u308a\u306f\u8abf\u6574\u3057\u305f\u3044\u2026<\/div><\/p>\n<p>\u3068\u3044\u3046\u6642\u306b\u306f\u3001relative\u3092\u4f7f\u3048\u3070OK\uff01\u914d\u7f6e\u306b\u5f71\u97ff\u3092\u51fa\u3055\u305a\u3001\u91cd\u306a\u308a\u9806\u3060\u3051\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u91cd\u306a\u308a\u9806\u3092\u81ea\u7531\u306b\u5909\u3048\u3089\u308c\u308b\u3068\u3001\u898b\u305b\u65b9\u3084\u52d5\u304d\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u304c\u5897\u3048\u307e\u3059\u306d\u3002\u305c\u3072\u3044\u308d\u3093\u306a\u4f7f\u3044\u65b9\u3092\u3057\u3066\u3001\u7d20\u6575\u3067\u4f7f\u3044\u3084\u3059\u3044WEB\u30b5\u30a4\u30c8\u3092\u4f5c\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u4f7f\u3046\u969b\u306b\u306fposition\u306e\u6307\u5b9a\u3092\u304a\u5fd8\u308c\u306a\u304f\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30e9\u30a4\u30bf\u30fc\u306e\u30ca\u30ca\u30df\u3067\u3059\u3002 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