Horntastic
1. You need to define a width for #site for it to center right, right now it's just at the Gaia default of 700-ish.
I think you need 950px, the size of your content area.
2. There is padding on your #content area, and that's extending the area a bit causing most of the extra space. Additionally, there is a margin on top and on bottom of #site causing the rest of it. So:
#content { padding: 0; }
#site { margin-top: 0; margin-bottom: 0; }
A lot of sections have padding and/or margins by default; they can mess with your calculated heights/widths.
Thank you so much for the reply. Number 1 worked perfectly! I typed in
#content { padding: 0; }
#site { margin-top: 0; margin-bottom: 0; }
but it's still not working.. Hmm..