This is a great site to create css3 buttons with gradients. Also downgrades gracefully.
There are many codes to memorize just to modify a WordPress theme, so it helps to have a mini cheat sheet if you are looking to make minor changes or even developing your own theme. This is why we have decided to list a few codes that you can probably use for reference when editing themes. Bookmarking this page, or print this article and paste it on your desk.