.VideoDisplay_a1{padding: 0 0 50px 0;width: calc(100% - 200px);margin:0 auto;/* height:830px; */}
.VideoDisplay_a1 h2{ display:none; line-height:30px; padding-bottom:30px;  font-size:30px; text-align:center; font-family:"微软雅黑";}
.VideoDisplay_a1_C{ }
.VideoDisplay_a1_back{text-align:center; height:40px; margin-top:30px;}
iframe{ width:100%; height:calc((100vw - 200px) / 1.25)}
embed{ width:100%; height:calc((100vw - 200px) / 1.25)}
.ykplayer-poster-logo{ background: none !important;}
@media (max-width:720px){
	.VideoDisplay_a1{ width:92%; }
	.VideoDisplay_a1_C video{width: 100% !important;}
	embed{ height:calc(92vw / 1.25);}
	}