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我的手机css汉堡包菜单无法正常工作，如果点击它，它不会保持打开状态，我不知道如何打开汉堡菜单内的下拉菜单。另外我的导航标题（.logo）很难居中，有没有人有解决方案？我的手机css无法正常工作
JSFidlle for easy viewability（移动CSS &的style.css在这里被合并只是背景丢失）
感谢您的帮助，并抱歉，如果我的代码看起来杂乱无章：/
我的代码：
index.html文件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Hello, I'm Sten</title>
<link rel="stylesheet" href="css/style.css">
<link rel="stylesheet" href="css/mobile.css">
<link rel="stylesheet" href="css/animate.css">
</head>
<body>
<div class="nav animated slideInDown">
<img src="img/hamburger.png" alt="" class="hamburger">
<div class="logo">
<h1>STEN</h1>
</div>
<ul>
<li>
<a href="#">PAGE</a>
<ul>
<li><a href="#">DROPDOWN</a></li>
<li><a href="#">DROPDOWN</a></li>
</ul>
</li>
<li><a href="#">PAGE</a></li>
<li><a href="#">PAGE</a></li>
<li><a href="#">PAGE</a></li>
</ul>
</div>
<div class="landing animated fadeIn">
<div class="container">
<h1>STEN</h1>
<hr>
<p>I'M A</p>
<h2>-OCCUPATION-</h1>
<button>KNOP</button>
<button>KNOP</button>
</div>
<div class="scroll" onClick="">
</div>
</div>
<div class="about">
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script scr="main.js"></script>
</body>
</html>
的style.css（主css文件）
* {
padding: 0;
margin: 0;
border: 0;
}
html, body {
height: 100%;
width: 100%;
font-family: 'Open Sans', sans-serif;
}
h1 {
font-weight: 300;
font-size: 50px;
}
.nav {
width: 100%;
height: 10%;
background-color: #F2F2F2;
border-bottom: 1px solid #E4E4E4;
text-align: center;
position: fixed;
z-index: 999;
box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}
.nav .hamburger {
display: none;
}
.nav .logo {
float: left;
margin-left: 10%;
}
.nav .logo h1 {
color: #000;
line-height: 10vh;
font-size: 32px;
}
.nav > ul {
height: 100%;
width: auto !important;
display: inline-block;
float: right;
margin-right: 10%;
}
.nav > ul > li {
display: inline-block;
list-style: none;
padding: 0 20px 0 20px;
vertical-align: top;
position: relative;
}
.nav > ul > li:first-child > a:after {
width: 6px;
height: 6px;
border-bottom: 1px solid #000;
border-right: 1px solid #000;
position: absolute;
margin-top: calc(5vh - 5px);
margin-left: 8px;
content: "";
transform: rotate(45deg);
}
.nav > ul > li > ul {
display: none;
margin-left: -50%;
box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}
.nav > ul > li > ul > li {
list-style: none;
background-color: #F2F2F2;
padding: 0 20px 0 20px;
position: relative;
}
.nav li:hover > ul {
display: block;
position: absolute;
}
.nav ul a {
color: #000;
text-decoration: none;
line-height: 10vh;
}
.nav a:hover {
color: #999;
}
.landing {
padding-top: 10vh;
height: 90%;
width: 100%;
background: url('../img/bg.jpg');
background-size: cover;
background-position: center;
position: fixed;
text-align: center;
color: #FFF;
box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
z-index: 0;
}
.landing:before {
content: " ";
position: absolute;
height: 100%;
width: 100%;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.4);
}
.landing .container {
position: absolute;
top: 50%;
left: 50%;
-moz-transform: translateX(-50%) translateY(-50%);
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
width: 100%;
}
.landing .container h1 {
letter-spacing: 6px;
font-size: 78px;
}
.landing .container p {
font-size: 20px;
font-weight: 100;
}
.landing hr {
width: 300px;
margin: 25px 0 25px 0;
margin-left: calc(50% - 150px);
border-bottom: 3px solid #EF2D56;
}
.landing button {
width: 200px;
padding: 24px;
margin-top: 20px;
position: relative;
color: #FFF;
background-color: transparent;
border: 1px solid #FFF;
}
.landing button:first-child {
margin-right: 1%;
}
.landing button:last-child {
margin-left: 1%;
background-color: #EF2D56;
border: 1px solid #EF2D56;
}
.landing button:hover {
cursor: pointer;
}
.landing button:focus {
outline: none;
}
.scroll {
width: 16px;
height: 16px;
border-bottom: 1px solid #FFF;
border-right: 1px solid #FFF;
position: absolute;
content: " ";
transform: rotate(45deg);
bottom: 0;
margin-bottom: 30px;
margin-left: calc(50% - 8px);
cursor: pointer;
}
.about {
height: 200%;
width: 100%;
background-color: #FFF;;
z-index: 50;
position: absolute;
margin-top: 100vh;
}
移动css文件
这似乎需要一个'hover'，因为你不能用手指悬停（至少，而不是设备可读的方式），它不会保持打开状态。 – DBS