<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
display: flow-root;
font: 16px / 32px serif;
white-space: pre;
background-color: yellow;
}
.clamp > div {
margin: 16px;
}
</style>
<div class="clamp"><div>Line 1
Line 2
Line 3
Line 4…</div></div>