contagous on "Spun Content width on pages."

I have been playing around with the Spun theme and I am using pages instead of posts for my site.

I can't for the life of me figure out how to expand the width of the content sections on the pages to fit the page more.

Any ideas?

I have included a screenshot of what i mean with some lines drawn on it to try and explain as the site it not live yet.

Window mode:
https://imageshack.us/scaled/large/849/capturelsi.png

Full Screen:
https://imageshack.us/scaled/large/42/captureoql.png

On the above screenshot, the red box is where the content maxes out. I would like to make it as large as the green box so it spans more width on the site if possible..

Here is the Demo site with the same restrictions I think. it looks different as I have background.

http://spun-demo.calobeedoodles.com/2008/09/05/readability-test

hope this all makes sense.

Thanks in advance.

P.S

Already have a child theme so any modifications can be done there. Just cant figure out what to use lol

Thanks