LindsayU on "Set different column widths on single page"

Hello,

http://www.lindsayulrich.com

I have used the following code to set a consistent text column width across my whole blog:

.post .content {
width: 38em;
margin: 0 auto;
}

But on on one of my pages (http://lindsayulrich.com/?page_id=2) I would like to make two columns. (probably 32em width). How do I do this?

Thank you,

Lindsay