#main-nav {
margin-left: 1px;
}
#main-nav.nav-tabs.nav-stacked > li > a {
padding: 10px 8px;
font-size: 12px;
font-weight: 600;
color: #4A515B;
background: #E9E9E9;
background: -moz-linear-gradient(top, #FAFAFA 0%, #E9E9E9 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#FAFAFA), color-stop(100%,#E9E9E9));
background: -webkit-linear-gradient(top, #FAFAFA 0%,#E9E9E9 100%);
background: -o-linear-gradient(top, #FAFAFA 0%,#E9E9E9 100%);
background: -ms-linear-gradient(top, #FAFAFA 0%,#E9E9E9 100%);
background: linear-gradient(top, #FAFAFA 0%,#E9E9E9 100%);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#FAFAFA', endColorstr='#E9E9E9');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#FAFAFA', endColorstr='#E9E9E9')";
border: 1px solid #D5D5D5;
border-radius: 4px;
}
#main-nav.nav-tabs.nav-stacked > li > a > span {
color: #4A515B;
}
#main-nav.nav-tabs.nav-stacked > li.active > a, #main-nav.nav-tabs.nav-stacked > li > a:hover {
color: #FFF;
background: #3C4049;
background: -moz-linear-gradient(top, #4A515B 0%, #3C4049 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#4A515B), color-stop(100%,#3C4049));
background: -webkit-linear-gradient(top, #4A515B 0%,#3C4049 100%);
background: -o-linear-gradient(top, #4A515B 0%,#3C4049 100%);
background: -ms-linear-gradient(top, #4A515B 0%,#3C4049 100%);
background: linear-gradient(top, #4A515B 0%,#3C4049 100%);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#4A515B', endColorstr='#3C4049');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#4A515B', endColorstr='#3C4049')";
border-color: #2B2E33;
}
#main-nav.nav-tabs.nav-stacked > li.active > a, #main-nav.nav-tabs.nav-stacked > li > a:hover > span {
color: #FFF;
}
#main-nav.nav-tabs.nav-stacked > li {
margin-bottom: 4px;
}
/*定义二级菜单样式*/
.secondmenu a {
font-size: 10px;
color: #4A515B;
text-align: center;
}
.navbar-static-top {
background-color: #212121;
margin-bottom: 5px;
}
.navbar-brand {
background: url('') no-repeat 10px 8px;
display: inline-block;
vertical-align: middle;
padding-left: 50px;
color: #fff;
}

<div class="navbar navbar-duomi navbar-static-top" role="navigation">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="/Admin/index.html" id="logo">配置管理系统（流量包月）
</a>
</div>
</div>
</div>
<div class="container-fluid">
<div class="row">
<div class="col-md-2">
<ul id="main-nav" class="nav nav-tabs nav-stacked" style="">
<li class="active">
<a href="#">
<i class="glyphicon glyphicon-th-large"></i>
首页 
</a>
</li>
<li>
<a href="#systemSetting" class="nav-header collapsed" data-toggle="collapse">
<i class="glyphicon glyphicon-cog"></i>
系统管理
<span class="pull-right glyphicon glyphicon-chevron-down"></span>
</a>
<ul id="systemSetting" class="nav nav-list collapse secondmenu" style="height: 0px;">
<li><a href="#"><i class="glyphicon glyphicon-user"></i>用户管理</a></li>
<li><a href="#"><i class="glyphicon glyphicon-th-list"></i>菜单管理</a></li>
<li><a href="#"><i class="glyphicon glyphicon-asterisk"></i>角色管理</a></li>
<li><a href="#"><i class="glyphicon glyphicon-edit"></i>修改密码</a></li>
<li><a href="#"><i class="glyphicon glyphicon-eye-open"></i>日志查看</a></li>
</ul>
</li>
<li>
<a href="./plans.html">
<i class="glyphicon glyphicon-credit-card"></i>
物料管理 
</a>
</li>
<li>
<a href="./grid.html">
<i class="glyphicon glyphicon-globe"></i>
分发配置
<span class="label label-warning pull-right">5</span>
</a>
</li>
<li>
<a href="./charts.html">
<i class="glyphicon glyphicon-calendar"></i>
图表统计
</a>
</li>
<li>
<a href="#">
<i class="glyphicon glyphicon-fire"></i>
关于系统
</a>
</li>
</ul>
</div>
<div class="col-md-10">
主窗口
</div>
</div>
</div> 

<link href="http://cdn.bootcss.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">
<script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
<script src="http://cdn.bootcss.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>