CSS Help

My wiki is required to be 800px due to my organization style requirements.

I have set the body to 800px and centered it via:

html,body
{
background-color: #000000;
margin-left: auto;
margin-right: auto;
width: 800px;
}

See the dashboard page here:
http://niskypto.wiki.zoho.com/

But this does not seem to get inhered to the main content page: Note how it extends beyond the top header/title...

http://niskypto.wiki.zoho.com/HomePage.html

There's a tag called "threeColLayout" which seems to control the whole content page. Under that is another tag for the whitespace called "contentwidth", but I cannot seem to modify it to fit within by 800px requirement.

I would appreciate any specify pointers in solving this issue. Thanks!