concept-grid-2.html

<div class="row">
    <div class="col-xs-3 red">
        First element on the first line
    </div>
    <div class="col-xs-4 blue">
        Second element on the first line
    </div>
</div>
<div class="row">
    <div class="col-xs-2 blue">
        First element on the second line
    </div>
    <div class="col-xs-6 red">
        Second element on the second line
    </div>
    <div class="col-xs-3 blue">
        Third element on the second line
    </div>
</div>