如何:居中水平菜单&子菜单

How To: Center Horizontal Menu & SubMenu

本文关键字：菜单 水平 如何      更新时间：2023-09-26

如何将导航菜单和子菜单水平居中?设置一个较小的导航列表"宽度"和设置"Margin:0 auto"不起作用。我还想保持导航栏的背景颜色在整个页面的宽度。

我的HTML: 

<div class="slide-down-page">
    <ul id="nav">
    <li id= "bio"><a class="active btn" href="home.html">Bio</a></li>
    <li id= "portfolio"><a href="portfolio.html">Portfolio</a>
        <ul>
            <li><a href="#">Writing</a>
            </li>
            <li><a href="#">Illustrations</a></li>
            <li><a href="#">Design</a></li>
        </ul> 
    </li>
    <li id= "contact"><a href="contact.html">Contact</a></li>
    </ul>
</div>

我的CSS: 

#nav{
margin: 0 ; padding: 0;
position: fixed;
width: 100%;
background:#e7e7e7;
}
#nav li {
list-style: none;
display: inline-block;
float: left;
}
#nav li a{
padding: 1em 2em;
display: inline-block;
text-decoration: none;
color: #F2583E;
font-family: 'Helvetica Neue';
font-size:1.25em;
background: #e7e7e7;
text-align: center;
margin: 0 auto;
}
#nav li a:hover{
background-color: #C1DAD6;
}
#nav a.active, #nav li:hover a.active{
background-color: #F2583E;
color: #F7F3E8;
cursor: default;
}
/*SubMenu*/
#nav li ul{
display: none;
}
#nav li:hover ul{
display: block;
position: absolute;
top: 63px;
width: 100%
left:0px;
background: #C1DAD6;
color:white;
}
#nav li:hover ul li, #nav li:hover ul li a{
display: inline-block;
float: left;
padding: 5px;
color:white;
background: #C1DAD6;
}
#nav li ul li:hover a{
color: #77bed2;
}
#nav li ul li{ 
 _display: inline-block; /* for IE5*/
 }
#nav li ul li a{
width: 150px;
}

如果你想在CSS中做到这一点，这里有一个方法:

1。删除#nav li的"float: left;"answers"#nav li:hover ul li， #nav li:hover ul li a"

2。添加"text-align: center;"到"#nav"

3。修复了#nav li:hover ul的width: 100%的问题，在width: 100%后添加;

4。添加"padding: 0;"到"#nav li:hover ul"

这里是固定的css代码: 
#nav{
margin: 0 ; padding: 0;
position: fixed;
width: 100%;
background:#e7e7e7;
text-align:center;
}
#nav li {
list-style: none;
display: inline-block;
}
#nav li a{
padding: 1em 2em;
display: inline-block;
text-decoration: none;
color: #F2583E;
font-family: 'Helvetica Neue';
font-size:1.25em;
background: #e7e7e7;
text-align: center;
margin: 0 auto;
}
#nav li a:hover{
background-color: #C1DAD6;
}
#nav a.active, #nav li:hover a.active{
background-color: #F2583E;
color: #F7F3E8;
cursor: default;
}
/*SubMenu*/
#nav li ul{
display: none;
}
#nav li:hover ul{
display: block;
position: absolute;
top: 63px;
width: 100%;
padding: 0;
left:0px;
background: #C1DAD6;
color:white;
}
#nav li:hover ul li, #nav li:hover ul li a{
display: inline-block;
padding: 5px;
color:white;
background: #C1DAD6;
}
#nav li ul li:hover a{
color: #77bed2;
}
#nav li ul li{ 
 _display: inline-block; /* for IE5*/
 }
#nav li ul li a{
width: 150px;
}
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