add white to style..

[Winterworks]

http://trasion.com/?styleid=4

See in between header, welcome notice, forums, all that, you can clearly see the background? I want it so you can't. So that where the header starts, and the footer starts, they're connected with a white line, and same where they finish.

And then it's all filled in, with white.

How do you do this? So I want like everything to be on white, and then around the white will be the background.

edit: that was a bad explaination.. here are some examples of what I want:

This is how it looks now:


I want it to be like: