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HTML

CSS

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JavaScript

Babel includes JSX processing.

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HTML

              
                <div class="wrapper">
	<div class="container">
    <p>container</p>
		<div class="fit">ここはコンテナ内に収まります</div>
		<div class="wide-full">ここは画面幅いっぱいに広がります</div>
    <div class="wide-fit">背景は画面幅いっぱい・コンテンツはコンテナ幅</div>
		<div class="wide-right">ここは右側だけ広がります</div>
		<div class="wide-left">ここは左側だけ広がります</div>
	</div>
</div>
              
            
!

CSS

              
                .wrapper{
	overflow: hidden;/* POINT! */
}

.container{
  background: lightgray;/* ライトグレー */
	width: 100%;
  max-width: 900px;
	margin-inline: auto;
	padding: 20px 60px;
}

p{
  text-align:center;
  margin-bottom:40px;
  font-size:30px;
}

/* コンテナ内に収めます */
.fit {
	background: darkgray;/* ダークグレー */
	padding: 20px;
}

/* 画面幅いっぱいに広げます */
.wide-full {
	background: lightcoral;/* レッド */
  margin-top: 20px;
  padding: 20px;
	margin-inline: calc(50% - 50vw);/* POINT! */
	width: 100vw;/* POINT! */
}

/* 背景は画面幅いっぱい・コンテンツはコンテナ幅 */
.wide-fit {
	background: lightsalmon;/* オレンジ */
  margin-top: 20px;
  padding: 20px calc(50vw - 50% + 10px);/* POINT! */
  margin-inline: calc(50% - 50vw);/* POINT! */
}

/* 右側だけ広げます */
.wide-right {
	background: cornflowerblue;/* ブルー */
  margin-top: 20px;
  padding: 20px;
	margin-right: calc(50% - 50vw);/* POINT! */
}

/* 左側だけ広げます */
.wide-left {
	background: lightseagreen;/* グリーン */
  margin-top: 20px;
  padding: 20px;
	margin-left: calc(50% - 50vw);/* POINT! */
}
              
            
!

JS

              
                
              
            
!
999px

Console