Editing Your Theme’s CSS Using Firebug
Ever wanted to change the look of something in your theme, but don’t know how? Learn how to make changes to your WordPress theme CSS using Firebug, a free Firefox browser add-on.
Firebug – http://getfirebug.com/
CSS Tips
Proper formatting:
.class-selector { color: #333333; }
#id-selector { background: #FFFFFF; }