John,
Take a look at this screenshot:
https://www.dropbox.com/s/cwfp2oowx89ylv8/screenie.png -hope that works first time I've ever shared an image that way. It won;t be up forever.
When you override things in Google Chrome, the css works fine. When you are building a site, it is a good idea to turn off the css combining in General settings. helps you understand where you need to edit the file. Turn that off, and we can have a proper look.
Try adding the css that I did in the screenshot, and see if it works.