I got this from Emily's page, so all credit goes to her!
Are you tired of changing EVERY single subpage on your website? Well, tire no more, because this tutorial helps you to change one little thing on your page!
The first css tag should be placed at the beginning, and the last css tag should be placed at the end. There should be NO TAGS in the middle. =). If you want to add a background code, put that as a separate code, not part of your css sheet.