Thank you Tim, I will try that, but I'm pretty sure I removed the entire margin line and it didn't make a bit of difference.

I did it using Firefox on Mac, so if it's not making a difference for you, then that rule is overwritten in one of the browser-specific style sheets, so you have to edit whichever it is, depending on your browser:

IE50Fixes.css IE55Fixes.css IE70Fixes.css IEMacFixes.css KHTMLFixes.css Opera6Fixes.css Opera7Fixes.css

Tim