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<!DOCTYPE html>
<html>
<title>Reference</title>
<style type='text/css'>
.container {
border: solid blue 4px;
height: 4em;
overflow: auto;
font: 20px/1 sans-serif;
}
.container > div {
height: 1em;
margin: 1em 0;
background: green;
}
</style>
<div id='instructions'>Test passes if there is a green stripe across the second quarter of the box below and no red.</div>
<div class="container">
<div></div>
</div>