nav a:nth-child(2){
	border-bottom: 2px solid white;
}
.introduce{
	height: 1900px;
	padding-left: 240px;
	margin: 50px 30px 0 0;
}
.introduce div{
	margin-bottom: 15px;
}
.introduce .consultive{
	width: 700px;
	height: 380px;
	color: white;
}
.introduce .project{
	width: 700px;
	height: 680px;
	color: white;
}
.introduce .consultive span,.introduce .project span{
	display: inline-block;
	text-indent: 2em;
	line-height: 30px;
}
.introduce div img{
	width: 700px;
	border: 1px solid white;
}
.introduce .service,.introduce .system{
	width: 700px;
	height: 380px;
	color: white;
}
.introduce .service img,.introduce .system img{
	width: 300px;
	height: 350px;
	border: 1px solid white;
}
.introduce .service span{
	display: inline-block;
	float: right;
	width: 300px;
	color: white;
	font-size: 18px;
	font-family: "幼圆";
	text-indent: 2em;
	line-height: 30px;
}
.introduce .system span{
	display: inline-block;
	float: left;
	width: 300px;
	color: white;
	font-size: 18px;
	font-family: "幼圆";
	text-indent: 2em;
	line-height: 30px;
}
.introduce .system img{
	float: right;
}