Help format my header to look the same in all browsers and screen resolutions

Hi, I'm making a wordpress based (buddypress) site for a client of mine. No matter what I seem to try I can't figure out how to get the header to look the same in all browsers on all machines with different screen resolutions. Site at [Illuminations Cultural Experiences][1] I've heard some people say its because its a fluid theme, and they've tried to help me fix it, but I'm just not seeing what others see anywhere in the CSS file. If you can fix it, I'll pay you $20 via paypal. Let me know Thanks ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform wordpress