Remove sidebar and stretch out content

I have removed the sidebar, the problem I'm having is stretching the content over to where the sidebar use to be. I've been searching for hours for a solution but not having much luck.

Here is the page: http://misscouponer.com/?page_id=29

There is also no distinct css id or class for the individual pages, which would allow to change some widths selectively for the one page only; consider to add body_class() to the body tag (in header.php ?)

http://codex.wordpress.org/Function_Reference/body_class