create a grid using flexbox cs code example

Example: flex grid 3 columns

<div class="row around-xs">
    <div class="col-xs-2">
        <div class="box">
            around
        </div>
    </div>
    <div class="col-xs-2">
        <div class="box">
            around
        </div>
    </div>
    <div class="col-xs-2">
        <div class="box">
            around
        </div>
    </div>
</div>