Changing the width of Content and Sidebar (part 2)

Hello from Russia :) I was looking for a long time and bought Adventurous Pro Theme for my site. There are many settings in your theme and I like it. But the widht of Content area is vary small for my site, only 860px. I read a post about changing width of Content and Sidebar, but it is considered a different situation. http://catchthemes.com/support-forum/topic/changing-the-width-of-content-and-sidebar/ I need to increase the width Content area without changing the width of Sidebar. Please help me with this problem. For example, I want to increase the width Content area up to 1100px. What I need to wright in Custom CSS box? Dmitry