Dreamwidth style system discussion

I've modified the Boxes and Borders theme in Grass using the options in Customize Your Theme to include a background. I had to change the background color of the entries, modules, etc. to a solid color to allow the text to show and be legible. I'd really like to use custom entry pages for my journal, but unfortunately I don't see an option that would allow me to set a different background color for comments so they can be read. I currently have the entry pages set to display in the site layout, but I'll turn it back to my entry style if anyone wants to see what's going on.

Is there any way to do this? I'm fairly ignorant of coding, but if you explain it slowly, I ought to catch on pretty easily. :D Even just knowing if there's a better style variation for the theme I'm using that would make this possible would be wonderful.