Default button group and button group using contextual variants.
Set the size prop to lg or sm to render
larger or smaller, respectively, buttons. There is no need to
specify the size on the individual buttons.
Make a set of buttons appear vertically stacked rather than
horizontally by setting the vertical prop. Split
button dropdowns are not supported here.
Add <b-dropdown> menus directly inside your
<b-button-group>. Note that split dropdown
menus are not supported when prop codevertical is set.