*{box-sizing:border-box;margin:0;padding:0}body{background-color:#000;width:100vw;height:100vh;overflow:hidden}#main{z-index:9;width:100vw;height:100vh;display:none;position:absolute;top:0;left:0}#video{width:100vw;height:100vh}#debug{color:#fff;z-index:10;position:absolute;top:0}