I have created a site in CSS that seems to view fine on both a PC and a MAC, except the 'master' layer requires 2 extra pixels to it's width to display correctly on a MAC, hence creating a 2px blank "strip" on a PC.

I am using IE7 and Safari v312.5.
The website is here: http://www.upperdrive.co.uk/view/
and it's hosted on Windows.

Is there a safe server-side method of setting up 2 CSS stylesheets (one PC, one MAC) that I can use, or a "fix" that works?

Many thanks,