[Theme: Twenty Twelve] Search Results Page Uncentered

If you go to my website and do a search, the search results page is not centered like all of the other pages on the site. The grey space on the left is larger and there is no grey space on the right.

A while ago I modified the search.php in a twenty twelve child theme so that the search page would have no sidebar; however, deleting the search.php from my child theme so that it runs the original version has restored the sidebar but not fixed the centering issue.

I have no idea what I may have changed to cause this to happen. Any help or even suggestions on where I should look would be greatly appreciated.

Thanks!