基于bootstrap的后台二级垂直菜单

/*左侧菜单*/
.sidebar-menu{
    border-right: 1px solid #c4c8cb;
}
/*一级菜单*/
.menu-first{
    height:45px;
    line-height:45px;
    background-color: #e9e9e9;
    border-top: 1px solid #efefef;
    border-bottom: 1px solid #e1e1e1;
    padding: 0;
    font-size: 14px;
    font-weight: normal;
    text-align: center;
}
/*一级菜单鼠标划过状态*/
.menu-first:hover{
    text-decoration: none;
    background-color: #d6d4d5;
    border-top: 1px solid #b7b7b7;
    border-bottom: 1px solid #acacac;
}
/*二级菜单*/
.menu-second li a{
    background-color: #f6f6f6;
    height:31px;
    line-height:31px;
    border-top: 1px solid #efefef;
    border-bottom: 1px solid #efefef;
    font-size: 12px;
    text-align:center;
}
/*二级菜单鼠标划过样式*/
.menu-second li a:hover {
    text-decoration: none;
    background-color: #66c3ec;
    border-top: 1px solid #83ceed;
    border-bottom: 1px solid #83ceed;
    border-right: 3px solid #f8881c;
    border-left: 3px solid #66c3ec;
}
/*二级菜单选中状态*/
.menu-second-selected {
    background-color: #66c3ec;
    height:31px;
    line-height:31px;
    border-top: 1px solid #83ceed;
    border-bottom: 1px solid #83ceed;
    border-right: 3px solid #f8881c;
    border-left: 3px solid #66c3ec;
    text-align:center;
}
/*覆盖bootstrap的样式*/
.nav-list,.nav-list li a{
    padding: 0px;
    margin: 0px;
}

<div class="sidebar-menu">
    <a href="#userMeun" class="nav-header menu-first collapsed" data-toggle="collapse"><i class="icon-user-md icon-large"></i> 用户管理</a>
    <ul id="userMeun" class="nav nav-list collapse menu-second">
        <li><a href="#"><i class="icon-user"></i> 增加用户</a></li>
        <li><a href="#"><i class="icon-edit"></i> 修改用户</a></li>
        <li><a href="#"><i class="icon-trash"></i> 删除用户</a></li>
        <li><a href="#"><i class="icon-list"></i> 用户列表</a></li>
 
    </ul>
    <a href="#articleMenu" class="nav-header menu-first collapsed" data-toggle="collapse"><i class="icon-book icon-large"></i> 文章管理</a>
    <ul id="articleMenu" class="nav nav-list collapse menu-second">
        <li><a href="#"><i class="icon-pencil"></i> 添加文章</a></li>
        <li><a href="#"><i class="icon-list-alt"></i> 文章列表</a></li>
    </ul>
</div>