#canvas,body,html{width:100%;height:100%;overflow:hidden}*{margin:0;padding:0;box-sizing:border-box}body,html{background-color:#000;font-family:sans-serif}.back{position:absolute;left:5%;top:30px;text-decoration:none;color:#fff;background-color:rgba(0,0,0,0)}#canvas{position:fixed;touch-action:none}