.webgl{position:fixed;top:0;left:0}html,body{overflow:hidden;margin:0;padding:0;width:100%;height:100%}body:before{content:"Start WebXR";position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#ffff00;color:#000;padding:20px 40px;border-radius:10px;font-family:Arial,sans-serif;font-size:18px;font-weight:700;z-index:1000;pointer-events:none;transition:opacity .3s ease}body.xr-presenting:before{opacity:0}.xr-button,.webxr-button,button.webxr-button{display:none!important}