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<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<style>
html, body { margin: 0; padding: 0; }
.content {
margin-top: 100px;
width: 200px;
height: 200px;
background: blue;
}
</style>
<body>
<div class="content"></div>
</body>