CODE EXAMPLE FOR HTML

coreui dropdown

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenu" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown button
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenu">
    <a class="dropdown-item" href="#">Item</a>
    <a class="dropdown-item" href="#">Another item</a>
    <a class="dropdown-item" href="#">One more item</a>
  </div>
</div>