Bootstrap class: .d-sm-grid

    <div class="d-sm-grid gap-2">
        <button class="btn btn-primary" type="button">Button</button>
        <button class="btn btn-secondary" type="button">Button</button>
    </div>

Preview

Tips 💡

You don't need to remember all CSS classes. Just use the Bootstrap Editor instead.

More in Bootstrap Display

Bootstrap 4 & 5

Tailwind