老师，您好~

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>好好学习</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>慕课网</title>
    <meta name="keywords" content="" />
    <meta name="description" content="" />
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <link href="css/css.css" rel="stylesheet" type="text/css">
    <link href="css/layout.css" rel="stylesheet" type="text/css">
    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
    <script src="//cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
    <script src="//cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->
</head>
<body>
<div id="topback"></div>
<a class="back-up-btn btn btn-default btn-lg" href="#topback" aria-label="返回顶部">
    <span class="glyphicon glyphicon-menu-up" aria-hidden="true"></span>
</a>
<header id="page-head">
    <div class="container head-box">
        <nav class="navbar navbar-default">
            <div class="container-fluid">
                <!-- Brand and toggle get grouped for better mobile display -->
 <div id="head-logo"><img src="images/index_05.png"></div>
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                        <span class="sr-only">Toggle navigation</span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>
                </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 navbar-left">
                        <li class="active"><a href="#">首页</a></li>
                        <li><a href="#">产品</a></li>
                        <li><a href="#">关于</a></li>
                    </ul>
                    <div class="nav-tell hidden-xs hidden-sm hidden-md">4007-888888</div>
                </div><!-- /.navbar-collapse -->
 </div><!-- /.container-fluid -->
 </nav>
    </div>
</header>
<section class="banner">
    <img src="images/index_12.png" alt="">
</section>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="js/jquery.min.js" type="text/javascript"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>

@charset "utf-8";
/*css document*/
#page-head{
width: 100%;
height: 100px;
background: #f9f9f9;
position: fixed;
top:0;
z-index: 99;
}
#page-head+*{
margin-top: 100px;
}
.navbar-default{
border: 0;
border-bottom: 0;
}
#head-logo{
float: left;
margin-top: 15px;
}
.nav-tell{
float: right;
background: url("../images/index_08.png");
width: 186px;
height: 47px;
line-height: 47px;
font-size: 16px;
text-indent: 50px;
color: #ef200d;
margin-top: 27px;
}
.navbar-nav li{
width: 98px;
height: 100px;
text-align: center;
font-size: 16px;
margin-left: 40px;
}
.navbar-nav li a{
padding: 0;
margin: 0;
line-height: 100px;
color: #666;
}
.navbar-nav li.active a{
background: url("../images/index_02.png");
}
@media (max-width:992px){
.navbar-nav{
margin-left:0;
}
}
@media (max-width: 768px) {
.navbar-toggle{
margin-top: 22px
}
#head-logo{
margin-top: 8px;
}
#page-head{
height: 80px;
}
#page-head+*{
margin-top: 80px;
}
.navbar-nav{
margin-left: 0;
width: 100%;
}
.navbar-nav li{
width: 100%;
margin-left: 0;
height: 50px;
}
.navbar-nav li a{
line-height: 50px;
}
.navbar-collapse{
padding: 0;
}
}