<div class="u-dropdown u-dropdown--bottom-right is-opened">
              <button class="button button-primary u-dropdown-toggle" type="button" id="dropdown-test" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                Dropdown button
              </button>
              <div class="u-dropdown-menu" aria-labelledby="dropdown-test">
                <a class="u-dropdown-item" href="#">Action</a>
                <a class="u-dropdown-item" href="#">Another action</a>
                <a class="u-dropdown-item" href="#">Something else here</a>
              </div>
            </div>