添加一个 Bootstrap 类以垂直对按钮进行分组。
<div class="@(18)">
<button class="btn btn-primary">Apple</button>
<button class="btn btn-primary">Samsung</button>
<button class="btn btn-primary">Sony</button>
</div>
<div class="btn-group-vertical">
<button class="btn btn-primary">Apple</button>
<button class="btn btn-primary">Samsung</button>
<button class="btn btn-primary">Sony</button>
</div>