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多级css3渐变效果下拉菜单导航【荐】

css3下拉菜单导航，非常漂亮的动画菜单，而且是多级菜单的形式，测试时发现可支持5级，估计还可以支持更多的子菜单项，只有你想这么增加下去，CSS3实现的效果真的很棒，期待朋友们现在就赶快学习一下CSS3吧，这些Demo肯定会对你帮助很大。
答案：<!DOCTYPE HTML>
<html lang=zh-cn>
<head>
<meta charset=utf-8>
<title>css3下拉菜单导航</title>
<style>
*{margin:0px;padding:0px;}
body{background:#b1b1b1;margin:0px;padding:0px;font-size:14px;color:#000;}
.tips{width:702px;margin:0 auto;line-height:24px;padding-top:10px;}
.bredcolor{color:#fff;}
#menu {width:700px;text-align:center;height:38px;background:#069;margin:50px auto 300px auto;padding:3px 6px;border-radius:6px;box-shadow:0 15px 10px -15px rgba(0,0,0,0.5);}
#menu ul {margin:0;padding:0;list-style:none;white-space:nowrap;text-align:left;background:#069;}
#menu ul {display:inline-block;} 
#menu li {margin:0;padding:0;list-style:none;}
#menu li {display:inline-block;display:inline;}
#menu ul ul {position:absolute;left:-9999px;opacity:0;padding:3px 6px;border-radius:6px;box-shadow:0 15px 10px -15px rgba(0,0,0,0.5);
	-webkit-transition: opacity 1s;
	-moz-transition: opacity 1s;
	-ms-transition: opacity 1s;
	-o-transition: opacity 1s;
	transition: opacity 1s;
}
#menu ul.level1 {margin:0 auto;}
#menu ul.level1 li.level1-li {float:left;display:block;position:relative;}
#menu a {display:block;font:normal 12px tahoma, arial, 宋体b8b\4f53, sans-serif;color:#fff;line-height:30px;text-decoration:none;padding:0 20px 0 10px;margin:3px;background:#069;border:1px solid #09c;border-radius:3px;
	background-image:-webkit-gradient(linear, 0 0, 0 100%, color-stop(0, rgba(255, 255, 255, 0.7)), color-stop(0.5, rgba(255, 255, 255, 0.2)), color-stop(0.5, transparent), to(rgba(255, 255, 255, 0.3)));
	background-image:-moz-linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	background-image:-ms-linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	background-image:-o-linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	background-image:linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	-webkit-transition: 0.25s;
	-moz-transition: 0.25s;
	-ms-transition: 0.25s;
	-o-transition: 0.25s;
	transition: 0.25s;
}
#menu input {display:none;}
#menu label {display:block;font:normal 12px tahoma, arial, 宋体b8b\4f53, sans-serif;color:#fff;line-height:30px;padding:0 20px 0 10px;margin:3px;position:relative;background:#069;border:1px solid #09c;border-radius:3px;
	background-image:-webkit-gradient(linear, 0 0, 0 100%, color-stop(0, rgba(255, 255, 255, 0.7)), color-stop(0.5, rgba(255, 255, 255, 0.2)), color-stop(0.5, transparent), to(rgba(255, 255, 255, 0.3)));
	background-image:-moz-linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	background-image:-ms-linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	background-image:-o-linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	background-image:linear-gradient(top, rgba(255, 255, 255, 0.7) 0, rgba(255, 255, 255, 0.2) 50%, transparent 50%, rgba(255, 255, 255, 0.3) 100%);
	-webkit-transition: 0.25s;
	-moz-transition: 0.25s;
	-ms-transition: 0.25s;
	-o-transition: 0.25s;
	transition: 0.25s;
} 
#menu label img {position:absolute;left:0;top:0;width:100%;height:100%;}
#menu label b {color:#ff0;}
#menu ul.level1 li.level1-li a.level1-a {float:left;}
#menu input#tab1:checked ~ ul.level1 ul.ul1,
#menu input#tab2:checked ~ ul.level1 ul.ul2,
#menu input#tab3:checked ~ ul.level1 ul.ul3 {opacity:1;left:-6px;top:50px;}
#menu input#tab4:checked ~ ul.level1 ul.ul4 {opacity:1;left:auto;right:0;top:50px;}
#menu input#tab2a:checked ~ ul.level1 ul.ul2,
#menu input#tab2b:checked ~ ul.level1 ul.ul2,
#menu input#tab2c:checked ~ ul.level1 ul.ul2,
#menu input#tab2aa:checked ~ ul.level1 ul.ul2 {opacity:1;left:-6px;top:50px;}
#menu input#tab2a:checked ~ ul.level1 ul.ul2 ul.ul2a,
#menu input#tab2b:checked ~ ul.level1 ul.ul2 ul.ul2b,
#menu input#tab2c:checked ~ ul.level1 ul.ul2 ul.ul2c,
#menu input#tab2aa:checked ~ ul.level1 ul.ul2 ul.ul2a,
#menu input#tab2aa:checked ~ ul.level1 ul.ul2 ul.ul2a ul.ul2aa {opacity:1;left:100%;top:auto;margin-top:-40px;margin-left: 5px;}
#menu input#tab4a:checked ~ ul.level1 ul.ul4,
#menu input#tab4b:checked ~ ul.level1 ul.ul4,
#menu input#tab4aa:checked ~ ul.level1 ul.ul4 {opacity:1;left:auto;right:0;top:50px;}
#menu input#tab4a:checked ~ ul.level1 ul.ul4 ul.ul4a,
#menu input#tab4b:checked ~ ul.level1 ul.ul4 ul.ul4b,
#menu input#tab4aa:checked ~ ul.level1 ul.ul4 ul.ul4a,
#menu input#tab4aa:checked ~ ul.level1 ul.ul4 ul.ul4a ul.ul4aa {opacity:1;left:auto;right:100%;top:auto;margin-top:-40px;margin-right:5px;}
#menu li a:hover {border-color:#fff;} 
#menu label.close {position:absolute;width:100%;height:30px;display:none;padding:0;left:0;top:0;border:0;background:transparent;}
#menu input#tab1:checked ~ ul.level1 label.lab1,
#menu input#tab2:checked ~ ul.level1 label.lab2,
#menu input#tab2a:checked ~ ul.level1 label.lab2,
#menu input#tab2b:checked ~ ul.level1 label.lab2,
#menu input#tab2c:checked ~ ul.level1 label.lab2,
#menu input#tab2aa:checked ~ ul.level1 label.lab2,
#menu input#tab3:checked ~ ul.level1 label.lab3,
#menu input#tab4:checked ~ ul.level1 label.lab4,
#menu input#tab4a:checked ~ ul.level1 label.lab4,
#menu input#tab4b:checked ~ ul.level1 label.lab4,
#menu input#tab4aa:checked ~ ul.level1 label.lab4 {display:block;}
</style>
</head>
<body>
<div id="menu">
<input type="radio" name="tab" id="tab1" class="tabs">
<input type="radio" name="tab" id="tab2" class="tabs">
<input type="radio" name="tab" id="tab2a" class="tabs">
<input type="radio" name="tab" id="tab2aa" class="tabs">
<input type="radio" name="tab" id="tab2ab" class="tabs">
<input type="radio" name="tab" id="tab2b" class="tabs">
<input type="radio" name="tab" id="tab2c" class="tabs">
<input type="radio" name="tab" id="tab3" class="tabs">
<input type="radio" name="tab" id="tab4" class="tabs">
<input type="radio" name="tab" id="tab4a" class="tabs">
<input type="radio" name="tab" id="tab4aa" class="tabs">
<input type="radio" name="tab" id="tab4b" class="tabs">
<input type="radio" name="tab" id="tabclose" class="tabs">

	<ul class="level1">
		<li class="level1-li"><a class="level1-a" href="#">首 页</a></li>
		<li class="level1-li"><label for="tab1" class="open"><img src="/jscss/demoimg/201208/trans.gif" alt="">关于我 <b>↓</b></label><label for="tabclose" class="close lab1"><img src="/jscss/demoimg/201208/trans.gif" alt=""></label>
			<ul class="ul1">
				<li><a href="#">邮 箱</a></li>
				<li><a href="#">电 话</a></li>
				<li><a href="#">地 址</a></li>
			</ul>
		</li>
		<li class="level1-li"><label for="tab2"><img src="/jscss/demoimg/201208/trans.gif" alt="">度 假 <b>↓</b>&

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下一个：使用jQuery制作向下滑动的二级菜单

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