body{margin:0;padding:0;font-family:sans-serif}canvas{touch-action:none;user-select:none}#math-question{position:fixed;width:100%;font-size:1.5rem;text-align:center;padding-top:40px}#snake-length{position:fixed;bottom:0;width:100%;text-align:center;font-size:2rem}#gameover-container{background-color:#000a;position:fixed;width:100%;height:100dvh;top:0;left:0;display:grid;place-items:center;color:#fff}#retry{background:#fff;border:1px solid #aaa;padding:3px;color:#000;font-size:1.5rem}#message-container{text-align:center;place-items:center;position:fixed;width:100%;height:100dvh;display:none}#message{margin:5px;word-wrap:break-word;word-break:break-all}