Pure CSS3 Github Style Buttons
Github Style Pure CSS3 buttons! The main trick here is to use the border-radius property along with linear gradients (these are part of CSS3).
These buttons are not going to render properly in Internet Explorer 8 and below as those browsers do not support CSS3 gradients, rounded corners, text shadows, etc. IE9 does not support CSS3 gradients, although the filter property should render the gradients fine in IE9 and below.
For more examples, check here.