.video_box{
	width: 100%;
	min-height: 30px;
	margin-bottom: 20px;
}
.video_box video{
	width: 100%;
}
.introduce_txt{
	min-height: 200px;
	padding: 20px 0;
}
.introduce_left{
	float: left;
	width: 18%;
}
.introduce_right{
	float: left;
	width: 100%;
}
.cent_box{
	width: 100%;
	min-height: 200px;
	padding: 20px;
	/*display: none;*/
}
.cent_box.active{
	display: block;
}