Default buttons use class btn. If you want add color use class bg-@colorname.
Add class btn-rounded to get rounded corners.
Add class btn-outline to get outline button.
Add btn-rounded , btn-outline to quickly create rounded and outline button.
Add class disabled to get disabled button.
Add class btn-block to get block button.
Add class btn-xs, btn-sm, btn-md , btn-lg for additional sizes.
Add class active to get active button
Add class circle-xs, circle-sm, circle-md,
circle-lg to create circle button.
Wrap a series of buttons with btn in btn-group.
Add class btn-@socialnameto create social button.
Add for btn-@socialname class circle-xs, circle-sm, circle-md, circle-lg to create circle social button.