小编Pav*_*rov的帖子

如何更改打开的引导程序下拉选项的背景颜色。这是代码：

<nav class="navbar navbar-toggleable-sm navbar-inverse bg-faded">
  <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbar6">
        <span class="navbar-toggler-icon"></span>
    </button>
  <a href="#" class="navbar-brand">Title </a>
  <div class="navbar-collapse collapse justify-content-stretch" id="navbar6">
    <ul class="navbar-nav ml-auto">
      <li class="nav-item">
        <a class="nav-link" href="#">About<span class="sr-only">Home</span></a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Services
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Design</a>
          <a class="dropdown-item" href="#">Development</a>
          <a class="dropdown-item" href="#">Consulting</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Contact</a>
      </li>
    </ul>
  </div>
</nav>

在引导程序 3 中，我在以下帮助下对其进行了更改：

.navbar-default .navbar-nav > .open > a,
.navbar-default …