<div class="col-md-4">
  <div class="h-100 p-3 bg-dark text-white rounded-3">
    <div class="col w-100 row row-cols-2 row-cols-md-2 row-cols-lg-3 genre-list" style="font-size: 14px;">
      <h4 class="w-100">Genre</h4>
    </div>

    <div class="col w-100 row row-cols-6 row-cols-md-6 my-5 abj" style="font-size: 14px;">
      <h4 class="w-100">List A-Z</h4>
    </div>
    
    <!-- <p>Or, keep it light and add a border for some added definition to the boundaries of your content. Be sure to look under the hood at the source HTML here as we've adjusted the alignment and sizing of both column's content for equal-height.</p>
    <button class="btn btn-outline-secondary" type="button">Example button</button> -->
  </div>
</div>