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<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
#outer {
width: 100px;
height: 100px;
}
#inner {
width: 100%;
height: 100%;
background: green;
border-radius: 99px;
}
</style>
<p>Should be a green circle below</p>
<div id="outer">
<div id="inner"></div>
</div>