I am freaking on a "probably too easy to solve problem", but it just won't work or I just do everything wrong... sigh

I want to align (center) the menu in the wireframe1colwnews basic template. The padding (left) is set to 85px.... fine, now I want to center the menu. I tried different things, the last killing the left padding and adding a text-align:center to the #menu_wrapper. It just won't work....
Can somebody give me a hint ?
Thanks so much !
Philipp