Need Help with Positioning issues

Hi all,

I am trying to create myself a portfolio site and am almost done with it. I wanted to add a preloader to the homepage, but whenever I paste in the page wrapper element underneath the preloader, it messes up the entire layout of the page wrapper and throws it all off.

If you look at the styleguide page, that is how the body is supposed to look and then have a preloader over it. Help?

Here is my site Read-Only: