*{margin:0;padding:0}html,body{overflow:hidden}.webgl{position:fixed;top:0;left:0;outline:none}button.webxr-ar-button{position:absolute;top:10px;left:10px;z-index:1000;padding:8px 16px;background:#000;color:#fff;font-size:16px;border:none;cursor:pointer}