CSS customization of MistyLook, cell padding issue?

Hi:

Thanks for advance for your time in reading/responding to this posting. I really appreciate it! I’ll get right to the poimt: I’m customizing the css stylesheet of a WordPress theme called MistyLook by Sadish. I want to do an even color across the whole background of the site. I just have one sticking point: for the #content-main variable, I entered in: background:#F4FFFF. It solves 80% of the problem. The problem is it leaves a white border around the content area, cell padding I assume? So, my question is this: anyone know how to get rid of the white space without messing up the margins? Thank you so much for your input and here are my documents for reference:

http://www.kristinastevens.com/wordpress
http://www.kristinastevens.com/wordpress/wp-content/themes/kstevens/style.css

Thanks again for all your help!
Take care, Kristina