WordPress Tip: Changing the Styles on Your WordPres Blog
You can change the styles on your site easily by using Firebug and the Web Developer Extension. Both of these are extensions for Firefox. Using these two tools, you can find out what styles control the various elements of your site and then make the appropriate changes. I also explain how to add your new or updated styles to the right css file so that they overwrite the previous styles declared in other stylesheets.