I just switched over to TwentyTwelve and am really liking it so far. My only problem is that I'd like to change the widths of the body and sidebar, basically make the body wider.
I have a child theme and have fiddled with the rem values, and while it worked on getting my header placed higher on the blog, I can't get the widths of anything to change. What code do I need to change? Thanks!