<!DOCTYPE html>
<title>flexbox | flex-flow: row wrap-reverse</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<style>
div {
background: blue;
margin: 1em 0;
border: 1px solid black;
width: 20em;
}
span {
background: white;
margin: 1em;
width: 8em;
display: block;
float: left;
}
div::after {
content: "";
clear: both;
display: block;
}
</style>
<div>
<span>three</span>
<span>four</span>
<span>one</span>
<span>two</span>
</div>