html,body{width:100%;height:100%;margin:0;padding:0;position:relative;overflow:hidden;background-color:#02141b}video,img{max-width:100%;height:auto}.main-body{width:100%;height:100%;background:url(/assets/bg.png) no-repeat center top;background-size:cover;min-height:680px}.container{width:1400px;height:1px;margin:0 auto;position:relative}.btn-group{display:flex;flex-direction:column;position:absolute;z-index:2;left:-180px;top:0;width:400px}.title-font{margin-top:150px}.title-font>img{width:100%;margin:0 auto}.video-wrap{width:100%;margin-top:40px;border:1px solid #a16207}.btn-wrap{margin-top:100px}.playbtn{display:block;width:220px;height:62px;background:url(/assets/btn_play.png) no-repeat center top;background-size:100%;margin:0 auto}.playbtn:hover{background:url(/assets/btn_play_hover.png) no-repeat;background-size:100%}.duration-500{transition-duration:.5s}@media (max-width: 1440px){.container{width:980px}.btn-group{width:300px}.playbtn{width:180px;background-size:100%}}