Header borders extend beyond content area?

My wordpress blog is here. I had to tweak the Chunk theme a little to make it look the way I wanted it to, but for some reason, the header borders are extending well beyond the white content/container area. I have no idea what part of my code is causing this problem.
Here’s my theme code:

[ CSS moderated. That was way too many lines of code. Just post a link to your site, those who can help will know how to find your stylesheet. ]