Does anybody know how I can theme the ctools modal window? I've tried putting the css that it comes with in my own theme to over-ride it, but that is not working for me.
It turns out this was a super easy question to answer. I'm putting the answer here just in case someone else runs into the same problem I did:
My mistake was that I did not know that it wasn't enough to just include a modal.css file in my themes folder.
To correctly override a css file for a core/contributed module, the theme.info file edited to refer to that css:
stylesheets[all][] = modal.css
More information can be found at http://drupal.org/node/263967