Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<!--
http://www.sitepoint.com/forums/showthread.php?942215-Teaching-a-friend-CSS-Lessons-log
-->
<head>
<title>The Black Hole</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="content-language" content="en-us">
<style type="text/css">
html,
body {
padding:0px;
margin:0px;
}
body {
background-color:#888;
}
.blackhole {
width:40px;
height:40px;
background-color:#000;
border-radius:50%;
position:fixed;
left:50%;
top:50%;
margin-left:-20px;
margin-top:-20px;
box-shadow:
0px 0px 30px 30px #fff,
0px 0px 30px 60px #f0f,
0px 0px 40px 90px #00f,
0px 0px 30px 130px #0ff,
0px 0px 30px 140px #0f0,
0px 0px 30px 180px #ff0,
0px 0px 30px 210px #f00,
0px 0px 0px 240px #000,
0px 0px 6px 244px #fff;
}
</style>
</head>
<body>
<div class="blackhole"></div>
</body>
</html>
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