[fadattf]

I've just taken a quick look on your stylesheets!

To re-center your layout please remove the following part from your hoverbox.css file.

body
{
	background: #fff;
	color: #777;
	margin: 0 auto;
	padding: 50px;
	position: relative;
	width: 620px;
}

Note:
Since the Hoverbox-technique is a CSS only technique it comes already with some "defaults" in the hoverbox.css file.
If it doesn't fit perfect with the rest of your css it can be that some modifications are needed.