Changing Colors

I am new to Drupal and have been playing with the Calendar module a bit and have gotten it to work the way I like but I'm having one little problem. I really want to change the colors of the calendar and the events that I put on it but I really have no idea how to do this. I have searched through the many tickets here and have not found anything that has led me in the right direction. I have tried editing everything in the calendar.css file but nothing has changed and I'm not sure where to look next. I'm guessing that this is a pretty easy thing to do, I just can't figure it out.

I would really appreciate a push in the right direction. Thanks in advance for your assistance.
-Chris