Elements:Button Groups
To create button groups simply wrap a series of buttons with the .btn class in a wrapper with the .btn-group class.
All button styles can be applied to the buttons within the group.
Styles
Default
Outline
Rounded
Button toolbar
Sizes
By adding .btn-group-lg or .btn-group-sm to the .btn-group you can alter the size of all the .btn elements within the button group.
Large
Default
Small
Nesting
You can also "nest" .btn-group elements within .btn-group groups if you want to use dropdown menus within the group.
Vertical Button Groups
Button groups can also flow vertically by adding the btn-group-vertical class instead of the btn-group class.