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<!DOCTYPE html>
<title>CSS Reference</title>
<style>
.container { width: 100px; }
.first { width: 100px; height: 10px; margin-bottom: 200px; background: blue; }
.second { width: 100px; height: 10px; background: green; }
</style>
<p>Blue rectangle, 200px gap, then green rectangle.</p>
<div class="container">
<div class="first"></div>
<div class="second"></div>
</div>