This question is asked many times. Its not easy for someone who is not into the code to find the bits they need. So to try and help I'll post the changes I have used. These are purly extracted from a stock install of CE. Only make changes in you user.css.  I have put the full css in a readable format into seperate files that are attached. Most people will only need the short user.css listed below. This should cover most thing. To change color of index background use element.style