Changing width in a fixed width theme (Red Light)

Hi Plzz help in this. I am highly frustrated not being able to sort it out. Any small help will be highly appreciated. Here is the problem.-

I am using the theme “Red Light 3.00 by TemplateLite.com”. Its a 3 column fixed width theme. I would like to extend the width of all 3 columns proportionally. That’s because I want my sidebars to be at least 230px, and if I am extending the sidebar width, then I will have to extend the main body area too.
Is there any way out?? I tried a lot, made lots of changes in style.css, but to no avail. I tried changing width in #container, #content etc. But no change. I am able to change the width of sidebars but not of the main text area.

Plzz help…

Here is the website- http://yuvarevolution.org