Hallo,
so könnte es gehen (habe nur den IE 6 hier):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Test</title>
<META http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<style type="text/css">
<!--
html, body {
height:100%;
width:100%;
margin:0;
padding:0;
}
div {
position:absolute;
top:15%;
left:15%;
right:15%;
bottom:15%;
width:70%;
height:70%;
border:1px solid black;
}
p {
text-align:center;
}
-->
</style>
</head>
<body>
<div>
<p>Ein mittiger Container.</p>
</div>
</body>
</html>
Grüße
Torsten