.box{
	padding: 100px 0;
	/* font-size: 16px; */
}
.toptitle{
    font-size: 24px;
    /*font-weight: bold;*/
    margin: 20px 0;
}
.title{
    margin: 20px 0;
    /*font-weight: bold;*/
	font-size: 15px;
	font-size: 18px;
}
video{
    margin: 100px 0;
}
.operation{
	width: 100%;
	height: 50px;
	line-height: 50px;
}
.operation div{
	cursor: pointer;
}
.detailleft{
	width: 16px;
	float: left;
}
.detailright{
	width: 16px;
	float: right;
}
.backtop, .backline, .backdark{
	position: absolute;
	left: 50%;
	transform: translateX(-50%);
	-webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -o-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
	width: 70px;
}
.topbanner{width: 100%;background-repeat: no-repeat;background-size: cover;background-position: center;margin-top: 40px;height: 500px;}