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我是新与HTML和CSS，但我正在做一个负责任的下拉菜单，我找不到为什么我的菜单/导航栏将不会在居中桌面版本。为什么我不能中心我的菜单栏/导航
我找到了here的菜单并下载了它。
这里是我的代码：
<style>
@import url(http://fonts.googleapis.com/css?family=roboto);
body {
background: #212121;
font-size: 22px;
line-height: 32px;
color: #ffffff;
margin: 0;
padding: 0;
word-wrap: break-word !important;
font-family: 'roboto', sans-serif;
}
h1 {
font-size: 60px;
text-align: center;
color: #FFF;
}
h3 {
font-size: 30px;
line-height: 34px;
text-align: center;
color: #FFF;
}
h3 a { color: #FFF; }
a { color: #FFF; }
h1 {
margin-top: 100px;
text-align: center;
font-size: 60px;
line-height: 70px;
font-family: 'roboto', sans-serif;
}
#container {
margin: 0 auto;
max-width: 890px;
}
p { text-align: center; }
.toggle, [id^=drop] {
display: none;
}
nav {
margin: 0;
padding: 0;
background-color: #254441;
}
#logo {
display: block;
padding: 0 30px;
float: left;
font-size: 20px;
line-height: 60px;
}
nav:after {
content: "";
display: table;
clear: both;
}
nav ul {
float: right;
padding: 0;
margin: 0;
list-style: none;
position: relative;
}
nav ul li {
margin: 0px;
display: inline-block;
float: left;
background-color: #254441;
}
nav a {
display: block;
padding: 0 20px;
color: #FFF;
font-size: 20px;
line-height: 60px;
text-decoration: none;
}
nav ul li ul li:hover { background: #000000; }
nav a:hover { background-color: #000000; }
nav ul ul {
display: none;
position: absolute;
top: 60px;
}
nav ul li:hover > ul { display: inherit; }
nav ul ul li {
width: 170px;
float: none;
display: list-item;
position: relative;
}
nav ul ul ul li {
position: relative;
top: -60px;
left: 170px;
}
li > a:after { content: ' +'; }
li > a:only-child:after { content: ''; }
/* Media Queries
--------------------------------------------- */
@media all and (max-width : 768px) {
#logo {
display: block;
padding: 0;
width: 100%;
text-align: center;
float: none;
}
nav { margin: 0; }
.toggle + a,
.menu { display: none; }
.toggle {
display: block;
background-color: #254441;
padding: 0 20px;
color: #FFF;
font-size: 20px;
line-height: 60px;
text-decoration: none;
border: none;
}
.toggle:hover { background-color: #000000; }
[id^=drop]:checked + ul { display: block; }
nav ul li {
display: block;
width: 100%;
}
nav ul ul .toggle,
nav ul ul a { padding: 0 40px; }
nav ul ul ul a { padding: 0 80px; }
nav a:hover,
nav ul ul ul a { background-color: #000000; }
nav ul li ul li .toggle,
nav ul ul a { background-color: #212121; }
nav ul ul {
float: none;
position: static;
color: #ffffff;
}
nav ul ul li:hover > ul,
nav ul li:hover > ul { display: none; }
nav ul ul li {
display: block;
width: 100%;
}
nav ul ul ul li { position: static;
}
}
@media all and (max-width : 330px) {
nav ul li {
display: block;
width: 94%;
}
}
</style><body>
<nav>
<div id="logo">Demo Page</div>
<label for="drop" class="toggle">Menu</label>
<input type="checkbox" id="drop" />
<ul class="menu">
<li><a href="#">Home</a></li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-1" class="toggle">Service +</label>
<a href="#">Service</a>
<input type="checkbox" id="drop-1"/>
<ul>
<li><a href="#">Service 1</a></li>
<li><a href="#">Service 2</a></li>
<li><a href="#">Service 3</a></li>
</ul>
</li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-2" class="toggle">Portfolio +</label>
<a href="#">Portfolio</a>
<input type="checkbox" id="drop-2"/>
<ul>
<li><a href="#">Portfolio 1</a></li>
<li><a href="#">Portfolio 2</a></li>
<li>
<!-- Second Tier Drop Down -->
<label for="drop-3" class="toggle">Works +</label>
<a href="#">Works</a>
<input type="checkbox" id="drop-3"/>
<ul>
<li><a href="#">HTML/CSS</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Python</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Blog</a></li>
<li><a href="#">Submit</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">About</a></li>
</ul>
</nav>
<h1> Mobile-compatible Responsive Dropdown Menu Demo </h1>
</body>
你想要它的中心？检查它在这里工作。 http://jsfiddle.net/GCu2D/906/ – ketan