body{font-family:'Inter',sans-serif;text-align:center;background:#f4f6f9;margin:0;padding:20px}.container{max-width:600px;margin:auto}input{padding:12px;font-size:18px;width:100%;max-width:320px;text-align:center;border-radius:8px;border:1px solid #ccc;font-family:'Inter',sans-serif}button{padding:10px 22px;margin-top:12px;cursor:pointer;border:none;border-radius:8px;background:#0077c8;color:#fff;font-size:16px;font-family:'Inter',sans-serif}canvas{width:100%;max-width:500px;height:auto;margin-top:20px;border-radius:12px;box-shadow:0 8px 20px rgba(0,0,0,.08)}