How can I style the social login buttons for Appointments+?

I've finally started to use Appointments+, and I'd like it so that people have to login with Facebook, Twitter, or Google+ (not WordPress) in order to make an appointment. So, two questions:
(1) Can I remove the WordPress login option altogether, but keep the other ones? I unchecked the box for WordPress, but the "register" text still appears, which tries to force people to my Network's user creation page.
(2) How can I style the buttons so they appear in a nice row, instead of a center-aligned column, with Twitter and Google+ all smushed together?