<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
--><html><head><meta charset="utf-8">
<title>CSS Test Reference</title>
<link href="mailto:ecoal95@gmail.com" rel="author" title="Emilio Cobos Álvarez">
<style>
.container {
background: gray;
height: 80px;
}
.panel {
background: lightblue;
width: 150px;
height: 80px;
}
.contents {
height: 10px;
width: 10px;
background: purple;
}
</style>
</head>
<body><div class="container">
<div class="panel">
<div class="contents"></div>
</div>
</div>
</body></html>