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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<html>
<head>
<title>
CSS Reference
</title>
<style>
.box {
display: flex;
border: 1px solid black;
margin: 5px 20px;
width: 100px;
float: left; /* For testing in "rows" */
font: 10px serif;
}
.box > *:nth-child(1) { background: turquoise; }
.box > *:nth-child(2) { background: salmon; }
br { clear: both; }
</style>
</head>
<body>
<!-- FIRST ROW -->
<div class="box">
<div>a</div>
<div>b</div>
</div>
<div class="box">
<div>a</div>
<div>b</div>
</div>
<br>
<!-- SECOND ROW -->
<div class="box">
<div>a</div>
<div>b</div>
</div>
<div class="box">
<div>a</div>
<div>b</div>
</div>
</body>
</html>