Vertically and Horizontally Centered Div

Here is a working example.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>{ visibility: inherit; } Centered Div</title>
<style type="text/css">
<!--
body {
	height: 100%; 
	margin: 0; 
	padding: 0;
	background: #666;
}
h1 {
	font-size: 1.2em;
	margin: 20px 0 0;
	font-family: Arial;
	text-align: center;
}
#centereddiv {
	position: absolute; 
	height: 50%; 
	width: 50%;
	left: 25%; 
	top: 25%; 
	border: 2px solid #000;
	background: #CCC;
}
-->
</style> 
</head>

<body>
<div id="centereddiv">
<h1>Vertically and Horizontally Centered Div</h1>  
</div>
</body>
</html>