html,body{margin:0;height:100%;background:#000;overflow:hidden}#fallback{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#000}#fallback img{width:min(70vw,520px)}#scene{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;background:#000}