Margin Issues

I'm working on a website located here:

About halfway down the homepage there is a heading called "Clients". I have it margined down so that it sits on the line and gives the affect of folding over. It lines up perfectly in Firefox but if I view it in Safari or Chrome the margins lie differently (don't go down as far).

Anyone know how to make this work cross browser? I'm having no luck what-so-ever.