Top
1/2
1/2

<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>
Middle
1/2
1/2

<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>
Bottom
1/2
1/2

<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>