<!DOCTYPE html>
<title>CSS Reference</title>
<link rel="author" title="Sergio Villar Senin" href="mailto:svillar@igalia.com" />
<style>
.box {
  width: 100px;
  height: 100px;
  border: 1px solid black;
}
#green-square {
    background: green;
    margin-top: 40px;
    width: 20px;
    height: 20px;
}
#green-rectange {
    background: green;
    width: 60px;
    height: 100px;
}
</style>

<p>Test passes if there are a (vertically centered) 20x20 and a 60x100 green boxes enclosed on each 100x100 square.</p>
<div class="box">
    <div id="green-square"></div>
</div>

<br>

<div class="box">
    <div id="green-rectange"></div>
</div>