Change column design of website

I am looking to make the right hand column of my website, 480 pixels - and still have everything line up appropriately. The website is CSS, and I don't know much about it. I don't know if it can be fixed by simply changing the CSS, or if each html page must be changed. If it is the html pages that need alterations, the winning bidder can simply give me the fix for one page and I should be able to transfer it to the rest myself. Here's an example of a page I would like adjusted [login to view URL]