Blog page post squishes with lower resolution or smaller window

Hello again!

Here I am again with a second question.. I've scoured the forums and cant seem to find an answer to this question.

When I view the page that blogs are posted to at a lower resolution, the center column gets squished into the center of the page and is basically unreadable. Is there a way to make the posts maintain a certain width? Currently they dont even extend to the margins (like they do when you click on the post title to see the entire blog post).

Here is the page in question http://kudickchiro.com/?page_id=134

Thank you again for your help. I have to say that I'm really enjoying WP and especially the Atahualpa theme. I'm learning a lot and am looking forward to making this site shine!

-Jeremy