<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
<style>
#limesquare {
width: 100px;
height: 100px;
background: lime;
}
</style>
</head>
<body>
<div id="limesquare"></div>
</body>
</html>