<div class="container">

    <!-- Stack the columns on mobile by making one full-width and the other half-width -->

    <div class="row">

      <div class="col-xs-12 col-md-8">.col-xs-12 .col-md-8</div>

      <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>

    </div>

    <!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->

    <div class="row">

      <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>

      <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>

      <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>

    </div>

    <!-- Columns are always 50% wide, on mobile and desktop -->

    <div class="row">

      <div class="col-xs-6">.col-xs-6</div>

      <div class="col-xs-6">.col-xs-6</div>

    </div>

</div>

<!-- /bootstrap grid example -->