iv class="col-md-8 themed-grid-col">
      <div class="pb-3">
        .col-md-8
      </div>
      <div class="row">
        <div class="col-md-6 themed-grid-col">.col-md-6</div>
        <div class="col-md-6 themed-grid-col">.col-md-6</div>
      </div>
    </div>
    <div class="col-md-4 themed-grid-col">.col-md-4</div>
  </div>

  <hr class="my-4">

  <h2 class="mt-4">Mixed: mobile and desktop</h2>
  <p>The Bootstrap v4 grid system has five tiers of classes: xs (extra small, this class infix is not used),