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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<style>
div { padding: 5px; display: inline-block; }
span { display: block; width: 2em; }
span:nth-child(7) { background: red; height: 1em; }
span:nth-child(6) { background: orange; height: 1.1em; }
span:nth-child(5) { background: yellow; height: 1.3em; }
span:nth-child(4) { background: green; height: 1.5em; }
span:nth-child(3) { background: blue; height: 1.7em; }
span:nth-child(2) { background: indigo; height: 1.9em; }
span:nth-child(1) { background: violet; height: 2em; }
</style>
</head>
<body>
<p>All four columns should look the same:
<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>