[pauldodman]

At this stage, we are not dealing with css.
Css is just for the styles we want to apply.
Firstly you need to find and add the code that you might then style using css.

All templates exist in the common_files folder.
X-Cart first looks for templates in the custom template folder - if they don't exist there, then it uses the default ones in the common folder.
Templates only exist in the custom folders if they have been modified.

So if there is no right_bar template in the custom folder, it is using the default one in the common folder.

You can edit that there, or you can upload it yourself to the custom folder, and it will then take precedence over the file in the common folder.

Again, if you use Webmaster mode, you'll see both the template in question, and which folder it is in.