Wow, regardless of how we used the stylevar... Do they not understand that they modified a default stylevar to make it look black, then neglected to use the stylevar in the normal spot by applying custom CSS instead? Where the stylevar would have been used, they used custom CSS to make it white. This is the reason I said to report it to them, and they should not be charging to fix that. If they aren't using the stylevar, then they shouldn't be touching it, otherwise it should be treated as a bug.
Anyway, as I said, you should be able to easily modify the stylevar yourself.