This theme support navigation buttons with a number of color options available:

To create a navigation button, navigation to the Menus screen:
Appearance > Menus
Select Screen Options from the top and toggle on CSS Classes:

Add the navigation link that you’d like to turn into a button and apply the color of the button to the navigation item’s CSS Class:

To create the material design click effect, add the class click-effect in addition to the color:

Currently supported colors:
- green
- red
- black
- blue
- orange
- grey
- purple
- yellow
- brown