HELP!! Wordpress theme customization help plzz

Hi I am pretty frustrated trying for more than 3-4 days, so I am forced to ask it here. Any small help will be highly appreciated. Here is the problem.-

I am using the wordpress 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