Your site looks like it's working perfectly. You've tested it with several different browsers under various resolutions. The HTML complies with the standards and your CSS is impeccable.

Even if all of the above statements are accurate, everything still might not be the way it should. We often design for screens and blissfully forget that we need to take other devices into account as well. It's surprising to notice that while printers are very widely used, a large part of designers seem to completely ignore them.