html
<div class="fixed-bg bg01">
<h1>見出し</h1>
</div>
<div class="scroll-bg bg-color01">
<p>コンテンツ</p>
</div>
<div class="fixed-bg bg02">
<h1>見出し</h1>
</div>
<div class="scroll-bg bg-color02">
<p>コンテンツ</p>
</div>
背景画像をつけるセクションに「background-attachment: fixed」を設定する
css
.fixed-bg {
min-height: 100vh;
background-attachment: fixed;
background-size: cover;
background-position: center;
}
.bg01 {
background-image: url(../images/bg01.jpg);
}
.bg02 {
background-image: url(../images/bg02.jpg);
}