          .col-md-8
          <div class="row">
            <div class="col-md-6">.col-md-6</div>
            <div class="col-md-6">.col-md-6</div>
          </div>
        </div>
        <div class="col-md-4">.col-md-4</div>
      </div>

      <hr>

      <h3>Mixed: mobile and desktop</h3>
      <p>The Bootstrap 3 grid system has four tiers of classes: xs (phones), sm (tablets), md (desktops), and lg (larger desktops). You can use nearly any combination of these classes to create more dynamic and flexible