css issue for content pages vs posts

[ Moderator note: moved to Fixing WordPress. Please do not use Developing With WordPress for these topics. ]

I am working on developing a theme based on twentytwelve, and the content for posts displays correctly, but extends past the page on the front page template. Anyone know how to style this so it works correctly? I can’t seem to find the classes in the style.css. Any help would be appreciated.

the posts page is http://www.reincarnations.com/news
the page example is http://www.reincarnations.com/news/test