I am currently developing this site: tochat.vn As viewing in Firefox 7.0.1, it has annoying white border at top of the page. I have been trying to remove the border in many ways, but nothing really works. Actually, there are 2 things I noticed, when I removed "margin: 0" on body tag (on reset.css) OR when I removed the "fixed" value of background-attachment of the "body" class (on style.css) the border disappeared. But I can't remove these attributes :( Any suggestion?