부트스트랩 드롭다운 메뉴를 스크롤 가능하게 만들 때 컨테이너가 확장되는 것을 방지하는 방법은 무엇입니까?

<code class="css">.scrollable-menu {
    height: auto;
    max-height: <desired max-height>;
    overflow-x: hidden;
}</code>

<code class="css">.scrollable-menu {
    height: auto;
    max-height: 200px;
    overflow-x: hidden;
}</code>

<code class="html"><ul class="dropdown-menu scrollable-menu" role="menu">
  <li><a href="#">Action</a></li>
  <li><a href="#">Another action</a></li>
  <li><a href="#">Something else here</a></li>
  <li><a href="#">Action</a></li>
  ...
  <li><a href="#">Action</a></li>
  <li><a href="#">Another action</a></li>
</ul></code>