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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.container {
border: 1px solid black;
width: 100px;
}
.bar {
margin-top: 100px;
height: 20px;
background: green;
}
</style>
<p>Test passes if the green bar is 100px below the black box's top border.</p>
<div class="container">
<div class="bar"></div>
</div>