how to change the width of the actual posts?

by Amortentia Cécile January 30th 2008, 18:17

I know how to change the width of the forum itself by going to admin/colors, but i need to know how to change the width of the actual posts. they are so wide, it's hard to read without scrolling to the right.
How do i change the width of the posts?

this is normal:
www.hogwartsekspresi.com
but, when you open a topic;
http://www.hogwartsekspresi.com/karanlyk-sanatlara-kary-savunma-derslioi-f67/sezonun-ilk-dersi-1-2-ve-3-synyflar-icin-ortak-t2184.htm#115109

thanks!