nav {
	width: 636px;
	margin-top: 24px;
	height: 50px;
	/*position: sticky;
	top: 0px;
	z-index: 99999;*/
	/*导航吸顶效果*/
}
nav li {
	width: 100px;
	height: 50px;
	line-height: 50px;
	float: left;
	text-align: center;
	position: relative;
}
nav li a {
	color: #000;
	display: inline-block;
	width: 100%;
	height: 100%;
}
nav li:hover a {
	color: #13B957;
}
nav li:hover dl a{
	color: #fff;
} 
nav i {
    margin-top: 15px;
    float: left;
    font-style: normal;
    color: #cacaca;
}
nav dl {
	position: absolute;
	top: 48px;
	z-index: 3;
	width: 100%;
}
nav li:hover dl dd{
	height: 40px;
	border-top: 1px solid #29c368;
}
nav dd {
	height: 0px;
	overflow: hidden;
	line-height: 40px;
	
	transition: ease 0.5s;
	background: #13B957;
}
nav dd a {
	color: #fff;
}
nav dd a:hover {
	background: #29c368;
}