*{margin:0;padding:0;list-style: none;}
img,a{margin:0; border:none; padding:0;vertical-align: top;}

	.box{
		width:100vw;
		/*max-width:640px;*/
	}
	.topbox{
		position: relative;
		/*background:url('') center no-repeat;
		background-size: cover;*/
	}
	.topbg{
		width:100%;
		/*border:solid 2px #ccc;*/
	}
		.con_box{
			position: absolute;
			bottom:0;
			/*background:#ccc;*/
		}
		.guitarimg{
			position: absolute;
			right:5vw;
			bottom: 55px;
			width:50px;
			z-index: 1000;
		}
		.videobox{
			/*position: absolute;*/
			/*!*left:10vw;*!*/
			/*bottom: 0px;*/
			/*width:100vw;*/
			position: absolute;
			left: 3vw;
			bottom: 82vw;
			width: 92vw;
		}
		.videobox #video{
			position: absolute;
			/* left: 10vw; */
			/*left: 2.5vw;*/
			/*bottom: 9px;*/
			/*width: 87vw;*/

			left: 4.5vw;
			bottom: 9px;
			width: 83vw;

			opacity: 0;
			/*height: 200px;*/
			z-index: 10;
		}
		#playbtn{
			position: absolute;
			left:50%;
			/*top:-130px;*/
			top:-99px;
			margin:-20px 0 0 -20px;
			width:40px;
			z-index: 1000;
		}
		#playposter{
			position: absolute;
			bottom:0;
			margin-left: 2.5%;
			/*height: 110px;*/
			width:96%;
			z-index: 16;
		}
		/*适配iphone5*/
		@media screen and (max-width: 320px){
		    .videobox #video{
				position: absolute;
				/*width:100%;*/
				/*height: 95px;*/
				z-index: 10;
			}
			.videobox #playbtn{
				position: absolute;
				left:50%;
				top:-80px;
				margin:-20px 0 0 -20px;
				
			}
			/*#playposter{
				height: 95px;
			}*/
		}
		/*适配iphone6plus*/
		@media screen and (min-width: 376px) and (max-width: 414px){
		    .videobox #video{
				position: absolute;
				/*width:100%;*/
				/*height: 120px;*/
				z-index: 10;
			}
			/*#playposter{
				height: 120px;
			}*/
		}
		/*适配ipad*/
		@media screen and (min-width: 415px) and (max-width: 768px){
		    .videobox #video{
				position: absolute;
				/*width:100%;
				height: 100px;*/
				z-index: 10;
			}
			/*#playposter{
				height: 100px;
			}*/
		}
		/*适配ipad pro*/
		@media screen and (min-width: 769px) and (max-width: 1024px) {
		    .videobox #video{
				position: absolute;
				/*width:100%;
				height: 120px;*/
				z-index: 10;
			}
			/*#playposter{
				height: 120px;
			}*/
		}
	.bmbtn{
		width:100px;
		position: absolute;
		z-index: 30;
		top:-9px;
		left:50%;
		margin:0 0 0 -50px;
	}
	.bottombox{
		position: relative;
	}
	.bottombg{
		position: absolute;
		left:0;
		top:0;
		width:100%;

	}
	.downbtn{
		position: relative;
		z-index: 1;
		margin:auto;
		display: block;
		width:200px;
		height:60px;
	}