Not sure what differences you are seeing, they are very close to each other when I view them in the different browsers for me. The differences you are seeing are probably due to the different ways in which each browser vendor implements html viewing, Internet explorer is usually the worse offender on this and tries to do things slightly different to everyone else and force their ideas .
The art to any site is trying to make it look as good as in you can in all the browsers, but they will never look 100% the same, even the most basic site ! I find firefox looks the best, then ie, then chrome seems to be trying to catch up. But thats just my view of course.
Was there anything in particular you felt was out ?