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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title></title>
<style type='text/css'>
div {
position: absolute;
padding: 10px;
border: 1px solid black;
background: red;
width: 100px;
height: 100px;
top: 20px;
left: 20px;
z-index: 4;
}
div > div {
background: lightblue;
z-index: 3;
}
div > div > div {
background: lightgreen;
z-index: 2;
}
div > div > div > div {
background: pink;
z-index: 1;
}
</style>
</head>
<body>
<div>
<div>
<div>
<div>
</div>
</div>
</div>
</div>
</body>
</html>
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