Content narrowed why?

I was messing around with navigation a lot yesterday and somehow now all my content is only 600pixels wide. I would like the content to stretch across the entire width of the wrapper (minus margins).

I must have overwritten something because no matter what code I add to change the site-content width…nothing works. But I was primarily working on navigation and footers yesterday so this leaves me confused.

Can anyone figure out what I did, and how to make my content width full again?
I did update wordpress yesterday, would that have reset anything?

YES I am using a child them for twenty twelve to the best of my ability.

Thanks in advance. This noob appreciates the help and advice.
http://saranacreview.com/