Change button styling for deposit button

The "please pay your deposit on PayPal now" which appears after a user confirms their appointment details shows up with white text on a white background.
You can view it here: http://lubeonthemove.com/make-an-appointment-3/

What options do we have to make this button more visible?

Additionally, the "Find available dates" button does not have any styling and we would like to make it look more professional.

Thank you.