Hi Liz,
I am sorry I think I will not be of much help.
I peeked in your stylesheet to see which pieces of code control the category sidebox to be able to try to change any of their colors, but without success.
Then I went to see the ID and Class details maybe to include a piece of code in you stylesheet to change color and also without success.
I am not sure what to do next as I am not a pro designer or programer, so I was only able to try to find a solution with the tools I have and with a bit of knowledge, but didnt work somehow. :blush:
Did you purchase this template soemwhere, you may ask also there for help?
Hopefully someone with more experince will help you out.
Best regards,
kruna