body{background-color:#87ceeb;margin:0;overflow:hidden}#app{width:100vw;height:100vh}#blocker{color:#fff;z-index:10;background-color:#ffffff4d;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;font-family:sans-serif;display:flex;position:absolute;top:0;left:0}#instructions{text-align:center;cursor:pointer;color:#f1c40f}#crosshair{color:#fff;pointer-events:none;z-index:5;text-shadow:1px 1px 2px #000;font-size:24px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}#ui-panel{color:#000;text-align:center;z-index:20;background-color:#fff;border-radius:8px;padding:20px 40px;font-family:sans-serif;display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 4px 15px #00000080}#ui-panel button{color:#fff;cursor:pointer;background-color:#333;border:none;border-radius:4px;margin-top:15px;padding:10px 20px}#ui-panel button:hover{background-color:#555}