Editing Terra Firma theme

[Connie]

It seems to me that you have no idea of CSS, is that right?

one way to find out what to do is:
use Webdeveloper-Addon in Firefox
load the page
identify the elements which must be edited.

I tested:

0) main.css is the the stylesheet for the theme
1) the sidebar is 266 pixel width
2) content is 655 or 950 pixel (there are 3 content-definitions)

so if you want to have the content take the complete width, add the 266 pixel (from sidebar) to content

I edited the css, attached it here as zip
test if that is what you want to acchieve