引导导航菜单在悬停时自定义

Question

我正在使用AngularJs和Bootstrap 3设法在悬停时进行基本的自定义：

使用这行代码：

.navbar-inverse .navbar-nav > li > a:hover, .navbar-inverse .navbar-nav > li > a:focus {
    background-color: #c9c9c9;
}

然而，当我将鼠标悬停在整个按钮背景灰色时，我想这样做：

在悬停时背景焦点的高度降低。

我怎样才能做到这一点？感谢

HTML

<div ng-controller="navigationController">
    <!-- Navigation -->
    <nav class="navbar navbar-inverse navbar-fixed-top" role="navigation" ng-hide="isConnected">
        <div class="container">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a class="navbar-brand" href="#/home"><img src="images/URBANE-logo-text.png" width="110" height="20"></a>
            </div>
            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav" ng-show="isMentee">
                    <li>
                        <a href="/home" data-toggle="collapse" data-target=".navbar-collapse">Home</a>
                    </li>
                        <a href="/login" data-toggle="collapse" data-target=".navbar-collapse">Logout</a>
                    </li