Q&A Plugin & dimensions in my WP

Dear all,

Please have a look at:

You can see that the content of the Q&A index is alligned 'left' instead of centered (940px) in the page.

The dimensions settings in WordPress however, I have set to 940px and centrered content.

Can you please help me with getting the Q&A plugin to look and work correctly?

Any help welcome!
Thanks in advance,