<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Demonstration of text-align: center</title>
<style type="text/css">
p {
width: 50%;
}
</style>
</head>
<body>
<p style="margin-left: auto; margin-right: auto;">this is a test. this is a test. </p>
<p>this is a test. this is a test. this is a test. this is a test. </p>
</body>
</html>