Can't set margin-top on main content DIV

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http://ubuntuforums.org – Hi all :) I have a page, and it has a floating (fixed) nav bar at the top, which fades to 0.1% opacity when not in use. The nav bar sits at the VERY TOP of the page, but I cannot get the main DIV to have a 50-100px margin between the bottom of the nav bar, and where the main DIV starts; at the moment, the nav bar is ACROSS the main DIV, and not separated by a neat space. Any ideas? I have pasted the code AND attached the source in ZIP: Thanks HTML ~~~~ Code: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1/ (Hardware)