nav a:nth-child(4){
	border-bottom: 2px solid white;
}
.introduce{
	width: 960px;
	height: 11350px;
	margin: 0 auto;
	margin-top: 50px;
}
.introduce div{
	width: 850px;
	height: 500px;
	color: white;
	margin: 0 auto;
	

}
.introduce div img{
	width: 850px;
	height: 420px;
	border: 1px solid white;
}
.introduce div span{
	display: inline-block;
	text-indent: 2em;
	line-height: 30px;
	font-size: 18px;
	font-family: "幼圆";
}
.top img{
	position: fixed;
	bottom: 180px;
	right: 55px;
	width: 25px;
	height: 40px;
	border-radius: 5px;
}
.introduce .img{
	width: 850px;
	height: 3250px;
	color:white;
	margin: 0px auto;
}
.introduce .img img{
	width: 850px;
	height: 640px;
                margin: 0px auto;
	border: 1px solid white;
}
.introduce .mg{
	width: 850px;
	height: 2180px;
	color: white;
	margin: 0px auto;

}
.introduce .cp{
	width: 850px;
	height: 900px;
	color: white;
	margin: 0px auto;}
.introduce .cp1{
	width: 850px;
	height: 1300px;
	color: white;
	margin: 0px auto;}

.introduce .jkpt{
	width: 850px;
	height: 500px;
	color: white;
	margin: 0px auto;}
.introduce .hzpp{
	width: 855px;
	height: 500px;
	color: white;
	margin: 0px auto;}
.introduce .ssm{
	width: 850px;
	height: 900px;
	color: white;
	margin: 0px auto;}
.introduce .rxtd{
	width: 850px;
	height: 900px;
	color: white;
	margin: 0px auto;}
.introduce .crkgl{
	width: 850px;
	height: 900px;
	color: white;
	margin: 0px auto;}




.introduce .img .imgs{
	width: 850px;
	height: 440px;
	border: 1px solid white;
}
.introduce .img span{
	display: inline-block;
	text-indent: 2em;
	line-height: 30px;
	font-size: 18px;
	font-family: "幼圆";
}