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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
div {
width: 400px;
height: 400px;
background: blue;
position: relative;
}
span {
background: green;
width: 200px;
height: 200px;
position: absolute;
bottom: 0;
left: 100px;
}
</style>
Should see a green square centered and at the bottom of the blue square.
<div><span></span></div>