Do you need a button on the website? Easy! Just use the Button add-on.
You can customize the button, which is the HTML tag 'a' in fact, as you wish. With the intuitive user interface of the dialog you can select a preferred style of the background, configure the borders, the rounding style of corners, adjust typography an so on. All settings are cross-browser.
The plugin doesn't attach additional CSS, all styles are built into the document (right into the `style` attribute).
See YouTube Demo Video: http://www.youtube.com/watch?v=q4n84WdlYKU