How to change padding/margins?

[jglover4168]

When you look at my site you can see there is the main page, and behind it is a black background. How can i resize the main page so there is less black and the forum is wider?
www.godlikescience.com
mybb version 1.4

[Jordan L.]

In global.css change your container's width to 90% or whatever.

[jglover4168]

thank you