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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.top {
width: 100px;
height: 30px;
background: green;
}
.bottom {
width: 100px;
height: 50px;
margin-top: 50px;
background: green;
}
</style>
<p>Test passes if there are two green rectangles with a gap between them.</p>
<div class="top"></div>
<div class="bottom"></div>