drop down

1<div class="dropdown">
2  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenu2" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
3    Dropdown
4  </button>
5  <div class="dropdown-menu" aria-labelledby="dropdownMenu2">
6    <button class="dropdown-item" type="button">Action</button>
7    <button class="dropdown-item" type="button">Another action</button>
8    <button class="dropdown-item" type="button">Something else here</button>
9  </div>
10</div>