Buttons which is actually a CSS buttons library built with Sass & Compass. The library contains modern, flexible and highly customizable buttons. Currently it offers you to download Flat, Icons, Glow, Rounded, Pill Square, Circle, Block, type buttons.
Everything is entirely customizable. Eventually if you want to customize these buttons, all you need to do is actually download buttons from GitHub and make sure you have Sass and Compass should be installed. Edit the _options.scss from the downloaded file with your own custom values.
In the root of the Buttons directory type compass watch on the command line. The buttons.css file should now be updated.