I have successfully installed Superfish by installing the Libraries module, downloading the Superfish library and putting it in /sites/all/libraries, and installing the Superfish module.
Now I would like to customize the look of it. The pre-built styles that show up in the drop-down in the Superfish Configuration could be a decent starting point, but I really would like to get into the details and get the measurements and colors just right.
How can I do this?