<!DOCTYPE html>
<title>flexbox | flex: N 0 N%</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<style>
div {
background: blue;
margin: 1em 0;
border: 1px solid black;
height: 8em;
width: 40em;
}
span {
background: yellow;
margin: 1em 0;
width: 10em;
height: 6em;
display: inline-block;
}
span:nth-child(2) {background: pink;}
span:nth-child(3) {background: lightblue;}
span:nth-child(4) {background: grey;}
</style>
<div>
<span>one</span><span>two</span><span>three</span><span>four</span>
</div>