<div class="sub-nav-mobile">
  <div class="select-sub-nav hide-md-up">
    <select id="">
      <option value="Option 1">Featured</option>
      <option value="Option 2">Running</option>
      <option value="Option 3">Completed</option>
      <option value="Option 3">Starting soon</option>
    </select>
  </div>

  <div class="select-sub-nav hide-md-up">
    <select id="">
      <option value="Option 1">All Categories</option>
    </select>
  </div>

  <div class="select-sub-nav hide-md-up">
    <select id="">
      <option value="Option 1">All Prizes</option>
    </select>
  </div>
</div>