@inkline/inkline/src/components/IButtonGroup/examples/vertical.html

Inkline is the Vue.js UI/UX Library built for creating your next design system

<i-button-group vertical>
    <i-button>Button 1</i-button>
    <i-button>Button 2</i-button>
    <i-button>Button 3</i-button>
</i-button-group>