html - 如何为 Bootstrap 列表组提供透明背景？

Question

我想为只有顶部边框的列表组提供透明背景。现在我得到默认的白色背景。

 <ul class="list-group">
     <li class="list-group-item">Cras justo odio</li>
     <li class="list-group-item">Dapibus ac facilisis in</li>
     <li class="list-group-item">Morbi leo risus</li>
     <li class="list-group-item">Porta ac consectetur ac</li>
     <li class="list-group-item">Vestibulum at eros</li>
 </ul>

Answer 1

<ul class="list-group  bg-transparent">
 <li class="list-group-item  bg-transparent">Cras justo odio</li>
 <li class="list-group-item  bg-transparent">Dapibus ac facilisis in</li>
 <li class="list-group-item  bg-transparent">Morbi leo risus</li>
 <li class="list-group-item  bg-transparent">Porta ac consectetur ac</li>
 <li class="list-group-item  bg-transparent">Vestibulum at eros</li>