[support] Mac display problem

[Roger]

Our Drual pages display well in W7, xp. Ubuntu, Fedora, 
firefox,chromium, IE etc on 5 different computers but on a wide screen 
mac the logo and header are substantially off to the left.
They are in the page block and position:absolute; in the style.css.
If position:relative; to page they float to the left edge of the monitor

Got me tossed.
Has anyone had this experience and found a way to fix it.
Thanks in advance
Roger