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CSS

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HTML 

              
                <div id="contents">
	<h1 class="ttl">スクロール位置によって要素を固定する<span class="code">" position:sticky; "</span></h1>
	<div class="inner flexbox">
	<main>
		<section>
			<h2 id="ttl1" class="sticky">見出し1</h2>
				<p>見出し固定のサンプルコード。ここではJavaScriptを使用せずにCSSのみでスクロールに応じた見出し固定を実現しています。<code>position: sticky;</code>を指定した要素の位置までスクロールすると固定されます。</p>
				<p><img src="https://placehold.jp/640x480.png" alt="" /></a></p>
				<p>あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。</p>
		<p>見出し1はここを過ぎると固定が解除されます。</p>
		</section>
		<section>
			<h2 id="ttl2" class="sticky">見出し2</h2>
			<p>見出し2はここから固定されます。</p>
			<p>親要素に<code>overflow:hidden;</code>があるとうまく動かないみたい。Internet ExplorerやEdgeでは使えないので使いどころが悩む所。</p>
			<p><img src="https://placehold.jp/640x480.png" alt="" /></a></p>
			<p>あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。</p>
		<p>見出し2はここを過ぎると固定が解除されます。</p>
		</section>
		<section>
			<h2 id="ttl3" class="sticky">見出し3</h2>
			<p>見出し3はここから固定されます。</p>
			<p>テーブルなんかも<code>posisition:sticky;</code>を使えばExcelのように見出し部分を固定することだって可能。ただし、FirefoxとOperaだとバグでうまく動作しないようです。<code>border-collapse:collapse;</code>との相性が悪いらしいので、テーブルで使用する際は<code>border-collapse:separate;</code>にしておきましょう。</p>
			<table>
				<thead class="thead-sticky">
					<tr>
						<th></th>
						<th>音声通話プラン</th>
						<th>データSMSプラン</th>
						<th>データ専用プラン</th>
						<th>音声通話プラン</th>
						<th>データSMSプラン</th>
						<th>データ専用プラン</th>
						<th>音声通話プラン</th>
						<th>データSMSプラン</th>
						<th>データ専用プラン</th>
					</tr>
				</thead>
				<tbody>
					<tr>
						<th class="th-sticky">3GB</th>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">7GB</th>
						<td>1,600円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">13GB</th>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">3GB</th>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">7GB</th>
						<td>1,600円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">13GB</th>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">3GB</th>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">7GB</th>
						<td>1,600円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">13GB</th>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">3GB</th>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">7GB</th>
						<td>2,300円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>2,300円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">13GB</th>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">3GB</th>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">7GB</th>
						<td>2,300円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>2,300円</td>
						<td>1,750円</td>
						<td>1,600円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
					<tr>
						<th class="th-sticky">13GB</th>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>3,500円</td>
						<td>2,950円</td>
						<td>2,800円</td>
						<td>1,600円</td>
						<td>1,050円</td>
						<td>900円</td>
					</tr>
				</tbody>
			</table>
			<p>あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。あのイーハトヴォのすきとおった風、夏でも底に冷たさをもつ青いそら、うつくしい森で飾られたモーリオ市、郊外のぎらぎら光る草の波。</p>
			<p class="yohaku">そんなにスクロールしても何もないよ。フッターまで見ちゃうタイプなんですね。</p>
		</section>
		<!-- /#contents -->
	</main>
	<aside>
		<div class="bnr">
			<div class="sticky"><a href="#bnr"><img src="https://placehold.jp/300x250.png" alt="" /></a></div>
		</div>
		<div class="toc sticky">
			<h2>目次</h2>
			<ul class="tocList">
				<li class="list"><a href="#ttl1">見出し1</a></li>
				<li class="list"><a href="#ttl2">見出し2</a></li>
				<li class="list"><a href="#ttl3">見出し3</a></li>
			</ul>
		<!-- /.toc --></div>
	</aside>
	<!-- /.inner.flexbox --></div>
</div>
!

CSS 

              
                // Google Font
@import url('https://fonts.googleapis.com/css?family=Poppins');

// mixin
$red: #f22;
$webfont: 'Poppins', sans-serif;


body {
	background-color:#f2f2f2;
}
#contents {
	max-width: 980px;
	margin:0 auto;
	background-color: #fff;
	h1 {
		padding: 40px 10px;
		font-size: 1.5rem;
		line-height: 1.5;
		text-align: center;
	}
	.code {
		display: inline-block;
		margin-left: 5px;
		color: $red;
		font-weight: bold;
		font-family: $webfont;
		vertical-align: middle;
	}
	.flexbox {
		display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    list-style: none;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
    -webkit-flex-direction: row;
    -ms-flex-direction: row;
    flex-direction: row;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
		main, aside {
			box-pack: justify;
			-webkit-box-pack: justify;
			-webkit-justify-content: space-between;
			-ms-flex-pack: justify;
		}
	}
	
	img {
		max-width:100%;
		height: auto;
	}
	
	/* ↓スクロールに応じて要素を固定↓ */
	.sticky {
		position: -webkit-sticky; // Safari用
		position:sticky; // 要素をスクロールに応じて固定
		top:0; // 縦スクロールに追従
		z-index: 100; // z-indexで最前面に持ってくる
	}
	.thead-sticky {
		position: -webkit-sticky; // Safari用
		position: sticky; // 要素をスクロールに応じて固定
		top: 0; // 縦スクロールに追従
		z-index: 3; // z-indexで前面に持ってくる
	}
	.th-sticky {
		position: -webkit-sticky; // Safari用
		position: sticky; // 要素をスクロールに応じて固定
		left: 0; // 横スクロールに追従
		z-index: 2; // z-indexで前面に持ってくる
	}
	/* ↑スクロールに応じて要素を固定↑ */
	
	h2 {
		padding: 1em 1.25em;
		line-height: 1.25;
		border-top:2px solid $red;
		box-shadow:0 1px 4px rgba(0,0,0,0.3);
		background-color: #fff;
	}
	main {
		flex:1;
		width:48%;
		section {
			padding-bottom: 30px;
			p.yohaku { margin-top: 2000px; }
		}
		p {
			margin:1.25em;
			line-height:1.7;
		}
		code {
			display: inline-block;
			margin: 5px;
			padding: 5px 12px 3px;
			background-color: #f2f2f2;
			font-family: $webfont;
			font-size: 13px;
			color:#888;
			line-height: 1.25;
			vertical-align: middle;
			border-radius:3px;
		}
		table {
			width: 100%;
			max-width: 680px;
			height:300px;
			overflow: auto;
			white-space: nowrap;
			display: inline-block;
			overflow-x: auto;
			table-layout:fixed;
			box-sizing:border-box;
			tr {
				th, td {
					position:relative;
					padding:1em;
					text-align:center;
					vertical-align:middle;
					border:1px solid #dedede;
					box-sizing:border-box;
				}
				th {
					background-color: #faebeb;
				}
			}
			tbody {
				tr:hover {
					th { background-color: #fdd8d8; }
					td {
						background-color: #f2f2f2;
						&:hover { background-color: #dedede; }
					}
				}
			}
		}
	}
	aside {
		width: 300px;
		.bnr {
			height: 768px;
		}
		.toc {
			.tocList {
				margin-top: 1em;	
			}
			.list {
				a {
					display: block;
					padding: 0.5em 1em;
					color: $red;
					text-decoration: none;
				}
			}
		}
	}
	
	// タブレット以下
	@media screen and (max-width: 768px) {
		.code {
			display: block;
		}
		.flexbox {
			display: block;
		}
		.sticky:not(h2) {
			position:static;
		}
		main, aside {
			width: auto;
		}
		main {
			table {
				max-width: 768px;
				font-size: 14px;
			}
		}
		aside {
			.bnr {
				position:static;
				height:auto;
				text-align: center;
			}
			.toc {
				margin-top: 1.25em;
			}
		}
	}
	@media screen and (max-width: 480px) {
		main table {
			font-size: 12px;
		}
	}
}
!

JS
!
999px

Console