CMS vB4 styling, cannot center site when using a fixed width
 

My current site I am working on is http://deathcompanygaming.net/epeenery/ .

I have made my way through styling pretty nicely so far without documentation but something as easy as centering my site when I use a fixed width is becoming increasingly annoying. I can create custom DIVs and edit all the main page templates but there has to be an easier global fix in the vBulliten.css file.

Any help out there would be appreciated.