body{margin:0;overflow:hidden;background-color:#87ceeb}canvas{display:block}#ui-container{position:absolute;top:20px;left:20px;color:#fff;font-family:sans-serif;font-size:24px;font-weight:700;text-shadow:2px 2px 0px #000;pointer-events:none}#game-over{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-family:sans-serif;text-align:center;display:none;background:rgba(0,0,0,.7);padding:20px;border-radius:10px;pointer-events:auto}#game-over h1{margin:0 0 10px;font-size:48px;color:#f44}#game-over p{font-size:24px;margin:0 0 20px}button{font-size:24px;padding:10px 20px;cursor:pointer;background:#fff;border:none;border-radius:5px;color:#333}button:hover{background:#eee}