New Post: Checkout templates

The checkout itself is not templated. Only the address is, which you've already found.

The stylesheet.css template in the Back Office contains the styles for the buttons.. it's well commented, so look in there.

To avoid messing up the default CSS, there's a secondary stylesheetoverride.css template that can be used to override the stylesheet.css. Just copy the relevant CSS from the first into the latter and then modify and save it.

Regards
Rob