.btn-primary.btn-secondary.btn-default.btn-success.btn-info.btn-warning.btn-danger
Add class .btn-outline | .btn-outline-inverse to get outlined buttons.
You can use the following class combinations:
.btn-link.btn-link.btn-link-light.btn-link.btn-link-text
Use class .btn-link-underline to emphasize a button while hovering.
Use .btn-lg, .btn-sm, .btn-xs for fast change button size.
.btn-block will make your button full-width unit.
Wrap a series of buttons into groups.
Wrap a series of buttons with .btn in .btn-group.
Combine sets of .btn-group into a .btn-toolbar for more complex components.
Make a set of buttons appear vertically stacked rather than horizontally
(.btn-group-vertical).
Instead of applying button sizing classes to every button in a group, just add
.btn-group-* to each .btn-group, including when nesting multiple groups.
Place a .btn-group within another .btn-group when you want
dropdown menus mixed with a series of buttons.