<div class="row flex-items-xs-top">
<div class="col-xs">
<span>1/2</span>
</div>
<div class="col-xs">
<span>1/2</span>
</div>
</div>
<div class="row flex-items-xs-middle">
<div class="col-xs">
<span>1/2</span>
</div>
<div class="col-xs">
<span>1/2</span>
</div>
</div>
<div class="row flex-items-xs-bottom">
<div class="col-xs">
<span>1/2</span>
</div>
<div class="col-xs">
<span>1/2</span>
</div>
</div>