please help!

okay i had a question / problem. i had a wicked forum maybe a week ago my partner made. i had to switch servers he didnt want to help. now i spent my whole weekend trying to learn how to install one of these things and i did.

http://www.homeoftheleafs.com/forum/...p?s=&styleid=1

this is where i'm at. im trying to make it look like my old board and let me tell you how sexy it looked lol . anyways ill get to the point how do i make the forum skinny instead of wide.

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if anyone could help me id appreciate it so much!!