CMS Article Page - Width Issues
 

During customization on the theme of my website, I noticed that my articles page is slightly irregular (view website: www.DistortedGuild.com ) I was unable to upload the image, kept giving me the error remote image too large...

Anyways, the Section list is 75% of the width of the website, and the Article content is scrunched up on the right. I'm attempting to make the Section list only 10% and the Article content area at least 90%... but I cannot find where to do this.

I'm pretty sure this is just user error, so any tips or suggestions are welcome and appreciated.

Thanks,
Jim