How do I fix the forum width?

[Reeve of shinra]

I'm trying to adapt a style to a forum and I need to fix the forum to 800px wide and center it. Is there a guide for doing that around here some place?

[Zachery]

Just edit the main style width setting in the style manager.

[Reeve of shinra]

Thanks, that worked great. For some reason, I thought it was more involved.