Row
This can be used to arrange many items horizontally (inline).
<div class="columns gap">
<div>Item one</div>
<div>Item two</div>
<div>Item three</div>
<div></div>
</div><!--/columns -->This can be used to arrange many items vertically.
Stack
<div class="columns flex-column gap">
<div>Item one</div>
<div>Item two</div>
<div>Item three</div>
<div></div>
</div><!--/columns -->