        <div class="col-md-8">
          .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 v4 grid system has five tiers of classes: xs (extra small), sm (small), md (medium), lg (large), and xl (extra large). You can use nearly any combination of these cl