change buttons customir theme

Hi – I need some help changing the call to action button on the customizr theme for the slider.

I tried changing the class in the slider.php to ‘btn-slider’ so that I could create a separate style but that did not override the current class. Maybe there is a better way to do it with the functions.php?

What I need is the slider button to look exactly the way it does but not influence the other call to actions. For the most apparent reason, I need the font two different colors.

Any suggestions how I can achieve this?

http://macrodiver.com