Div 100% width cross browser firefox issue

If you look at http://www2.currensee.开发者_开发知识库com in safari the page width is fine, but in firefox (3.6 at least) there is a horizontal scroll. Any ideas how I can fix this?

It's fine in FF6. You could try the CSS3 style html { overflow-x:hidden; } but I'm not sure if it was implemented in FF3.6.

if width is 100% and margin is > 0 you will get a scroll bar because the margin is extending outside the visible area.

A box shadow was causing the error.