<div class="d-flex flex-column flex-xxl-row-reverse bg-secondary p-1"">
<div class="p-3 bg-primary">1</div>
<div class="p-3 bg-info">2</div>
<div class="p-3 bg-warning">3</div>
<div class="p-3 bg-primary">4</div>
</div>
You don't need to remember all CSS classes. Just use the Bootstrap Editor instead.