Increase Post Width – LightBright Theme

Hello there !

I have the LightBright theme from ElegantThemes for WordPress.
As you all know that the post width of the LightBright Theme is very less. My website is : http://www.techiecrunch.com
I really need to know how to increase the post width of this theme as the area is really narrow and small such that I am not able to put large images. PLease help .. Here is my stylesheet.css file code :

[Large code excerpt removed by moderator per forum rules. Please use the pastebin for all large code excerpts.  It works better anyway.]