You can simply make your site in the center of the browser. In HTML you can use the table and you have to use the table's attribute like align=center.

Here is a simple code.
<html>
<head>
<title> Your personal site</title>
</head>
<body>
<table align=center width=100% height=100%>
<tr>
<td>Design the page as you like.</td>
</tr>
</table>
</body>

I think you will do this.