<link rel="stylesheet" type="text/css" href="css/reset.css">
<link rel="stylesheet" type="text/css" href="css/responsive.css">
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/main.js"></script>
<header>
<div class="wrapper">
<a href="#"><img src="img/logo.png" class="logo" alt="" titl=""/></a>
<a href="#" class="hamburger"></a>
<nav>
<ul>
<li><a href="#">首页</a></li>
<li><a href="#">产品</a></li>
<li><a href="#">服务</a></li>
<li><a href="#">加入我们</a></li>
<li><a href="#">帮助中心</a></li>
</ul>
<a href="#" class="login_btn">登录</a>
</nav>
</div>
</header><!-- end header section -->
头部文件写法有问题吗?用的是background: rgba();