I’m not sure if code is missing from your post or you simply wanted to provide the CSS selectors only, but as a general rule it’s best to share code using a service like Pastebin or Gist (as the forum can and does drop code when it’s pasted into a post directly).
We wouldn’t recommend editing core plugin files directly, even CSS files. Please take a look at the Themer’s Guide for an overview of how to do things here.
Hi, mbarnes. As it’s been over two weeks since your last reply, I’m going to close this thread. Please open a new one if you choose to pursue this further in the future.