Question

我在网上找到了这个脚本，但是在使用它的时候它只剩下浮动的左侧。我想在DIV的中心（id =＆＃34; menuback＆＃34;）。

尝试了以下但没有工作......

利润率左：汽车;
余量右：汽车;
文本对齐：中心;

＆＃13;

ul {
	list-style-type:none;
	margin:0;
	padding:0;
	position: absolute;
}

/*Create a horizontal list with spacing*/
li {
	display:inline-block;
	float: left;
	margin-right: 1px;
}

/*Style for menu links*/
li a {
	display:block;
	min-width:140px;
	height: 50px;
	text-align: center;
	line-height: 50px;
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	color: #fff;
	background: #2f3036;
	text-decoration: none;
}

/*Hover state for top level links*/
li:hover a {
	background: #19c589;
}

/*Style for dropdown links*/
li:hover ul a {
	background: #f3f3f3;
	color: #2f3036;
	height: 40px;
	line-height: 40px;
}

/*Hover state for dropdown links*/
li:hover ul a:hover {
	background: #19c589;
	color: #fff;
}

/*Hide dropdown links until they are needed*/
li ul {
	display: none;
}

/*Make dropdown links vertical*/
li ul li {
	display: block;
	float: none;
}

/*Prevent text wrapping*/
li ul li a {
	width: auto;
	min-width: 100px;
	padding: 0 20px;
}

/*Display the dropdown on hover*/
ul li a:hover + .hidden, .hidden:hover {
	display: block;
}

/*Style 'show menu' label button and hide it by default*/
.show-menu {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	text-decoration: none;
	color: #fff;
	background: #19c589;
	text-align: center;
	padding: 10px 0;
	display: none;
}

/*Hide checkbox*/
input[type=checkbox]{
    display: none;
    -webkit-appearance: none;
}

/*Show menu when invisible checkbox is checked*/
input[type=checkbox]:checked ~ #menu{
    display: block;
}


/*Responsive Styles*/

@media screen and (max-width : 760px){
	/*Make dropdown links appear inline*/
	ul {
		position: static;
		display: none;
	}
	/*Create vertical spacing*/
	li {
		margin-bottom: 1px;
	}
	/*Make all menu links full width*/
	ul li, li a {
		width: 100%;
	}
	/*Display 'show menu' link*/
	.show-menu {
		display:block;
	}
}

＆＃13;

<div id="menuback" style="text-align:center"> 
	<label for="show-menu" class="show-menu">Show Menu</label>
	<input type="checkbox" id="show-menu" role="button">
	<ul id="menu">
		<li><a href="#">menu1</a></li>
		<li>
			<a href="#">menu2</a>
			<ul class="hidden">
				<li><a href="#">sub1</a></li>
				<li><a href="#">sub2</a></li>
			</ul>
		</li>
		<li>
			<a href="#">menu3</a>
			<ul class="hidden">
				<li><a href="#">sub1</a></li>
				<li><a href="#">sub2</a></li>
				<li><a href="#">sub3</a></li>
			</ul>
		</li>
		<li><a href="#">menu4</a></li>
		<li><a href="#">menu5</a></li>
	</ul>
</div>

＆＃13;

Answer 1

为菜单指定一个特定宽度，例如400px并设置其边距：0 auto;

Answer 2

问题是您的ul#menu有position: absolute所以它不会跟踪文档的流程，因此请移除position: absolute一组display: inline-block

像这样：

＆＃13;

ul {
	list-style-type:none;
	margin:0;
	padding:0;
	/*position: absolute;*/ /*removed*/
    display: inline-block; /*added*/
}

/*Create a horizontal list with spacing*/
li {
	display:inline-block;
	float: left;
	margin-right: 1px;
}

/*Style for menu links*/
li a {
	display:block;
	min-width:140px;
	height: 50px;
	text-align: center;
	line-height: 50px;
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	color: #fff;
	background: #2f3036;
	text-decoration: none;
}

/*Hover state for top level links*/
li:hover a {
	background: #19c589;
}

/*Style for dropdown links*/
li:hover ul a {
	background: #f3f3f3;
	color: #2f3036;
	height: 40px;
	line-height: 40px;
}

/*Hover state for dropdown links*/
li:hover ul a:hover {
	background: #19c589;
	color: #fff;
}

/*Hide dropdown links until they are needed*/
li ul {
	display: none;
}

/*Make dropdown links vertical*/
li ul li {
	display: block;
	float: none;
}

/*Prevent text wrapping*/
li ul li a {
	width: auto;
	min-width: 100px;
	padding: 0 20px;
}

/*Display the dropdown on hover*/
ul li a:hover + .hidden, .hidden:hover {
	display: block;
}

/*Style 'show menu' label button and hide it by default*/
.show-menu {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	text-decoration: none;
	color: #fff;
	background: #19c589;
	text-align: center;
	padding: 10px 0;
	display: none;
}

/*Hide checkbox*/
input[type=checkbox]{
    display: none;
    -webkit-appearance: none;
}

/*Responsive Styles*/

@media screen and (max-width : 760px){
	/*Make dropdown links appear inline*/
	ul {
		position: static;
		display: none;
	}
	/*Create vertical spacing*/
	li {
		margin-bottom: 1px;
	}
	/*Make all menu links full width*/
	ul li, li a {
		width: 100%;
	}
	/*Display 'show menu' link*/
	.show-menu {
		display:block;
	}
    /*Show menu when invisible checkbox is checked*/
    input[type=checkbox]:checked ~ #menu{
      display: block; /*setting block at low resolution*/
    }
}

＆＃13;

<div id="menuback" style="text-align:center"> 
	<label for="show-menu" class="show-menu">Show Menu</label>
	<input type="checkbox" id="show-menu" role="button">
	<ul id="menu">
		<li><a href="#">menu1</a></li>
		<li>
			<a href="#">menu2</a>
			<ul class="hidden">
				<li><a href="#">sub1</a></li>
				<li><a href="#">sub2</a></li>
			</ul>
		</li>
		<li>
			<a href="#">menu3</a>
			<ul class="hidden">
				<li><a href="#">sub1</a></li>
				<li><a href="#">sub2</a></li>
				<li><a href="#">sub3</a></li>
			</ul>
		</li>
		<li><a href="#">menu4</a></li>
		<li><a href="#">menu5</a></li>
	</ul>
</div>

＆＃13;

如果您希望菜单有position: absolute由于某种原因添加一个位置

的包装

像这样：

＆＃13;

.menu-wrapper{          /*added*/
  position: absolute;
  width: 100%;
}

ul {
	list-style-type:none;
	margin:0;
	padding:0;
	/*position: absolute;*/ /*removed*/
    display: inline-block; /*added*/
}

/*Create a horizontal list with spacing*/
li {
	display:inline-block;
	float: left;
	margin-right: 1px;
}

/*Style for menu links*/
li a {
	display:block;
	min-width:140px;
	height: 50px;
	text-align: center;
	line-height: 50px;
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	color: #fff;
	background: #2f3036;
	text-decoration: none;
}

/*Hover state for top level links*/
li:hover a {
	background: #19c589;
}

/*Style for dropdown links*/
li:hover ul a {
	background: #f3f3f3;
	color: #2f3036;
	height: 40px;
	line-height: 40px;
}

/*Hover state for dropdown links*/
li:hover ul a:hover {
	background: #19c589;
	color: #fff;
}

/*Hide dropdown links until they are needed*/
li ul {
	display: none;
}

/*Make dropdown links vertical*/
li ul li {
	display: block;
	float: none;
}

/*Prevent text wrapping*/
li ul li a {
	width: auto;
	min-width: 100px;
	padding: 0 20px;
}

/*Display the dropdown on hover*/
ul li a:hover + .hidden, .hidden:hover {
	display: block;
}

/*Style 'show menu' label button and hide it by default*/
.show-menu {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	text-decoration: none;
	color: #fff;
	background: #19c589;
	text-align: center;
	padding: 10px 0;
	display: none;
}

/*Hide checkbox*/
input[type=checkbox]{
    display: none;
    -webkit-appearance: none;
}


/*Responsive Styles*/

@media screen and (max-width : 760px){
	/*Make dropdown links appear inline*/
	.menu-wrapper {
		position: static;
		display: none;
	}
	/*Create vertical spacing*/
	li {
		margin-bottom: 1px;
	}
	/*Make all menu links full width*/
	ul li, li a {
		width: 100%;
	}
    ul{
      display: block;
    }
	/*Display 'show menu' link*/
	.show-menu {
		display:block;
	}
  /*Show menu when invisible checkbox is checked*/
    input[type=checkbox]:checked ~ .menu-wrapper{  /*added the .menu-wrapper selector*/
       display: block;   /*setting block at low resolution*/
    }
}

＆＃13;

<div id="menuback" style="text-align:center"> 
	<label for="show-menu" class="show-menu">Show Menu</label>
	<input type="checkbox" id="show-menu" role="button">
  
    <div class="menu-wrapper"> <!--added awrapper-->
	<ul id="menu">
		<li><a href="#">menu1</a></li>
		<li>
			<a href="#">menu2</a>
			<ul class="hidden">
				<li><a href="#">sub1</a></li>
				<li><a href="#">sub2</a></li>
			</ul>
		</li>
		<li>
			<a href="#">menu3</a>
			<ul class="hidden">
				<li><a href="#">sub1</a></li>
				<li><a href="#">sub2</a></li>
				<li><a href="#">sub3</a></li>
			</ul>
		</li>
		<li><a href="#">menu4</a></li>
		<li><a href="#">menu5</a></li>
	</ul>
    </div>
</div>

＆＃13;

Answer 3

将此CSS添加到ul

ul {
  left: 50%;
  transform: translate(-50%,0);
}

使用菜单脚本时，它只浮动左侧。我怎么能把这个DIV中心

3 个答案: