I'm having trouble finding out where a color is coming from in the Event List page.

http://exaltyoga.com/workshops/current-workshops

The "Event Details" and "Book Now" buttons have awful colors. It would seem the text color is coming from my joomla template which I'm fine with, but I can't find where the button background color is coming from. Can you tell me which CSS file and which entry this is in so I can change it? For both buttons, it's calling:

class="btn btn-primary mat_btn_book"

I'm just having issues finding this. I appreciate your help.