body{font-family:Arial,sans-serif;text-align:center}.container{max-width:500px;margin:auto;padding:20px;background:#f9f9f9;border-radius:10px;box-shadow:0 0 10px rgba(0,0,0,.1)}input,select{width:100%;padding:8px;margin:10px 0;border:1px solid #ccc;border-radius:5px}.result{font-size:20px;font-weight:700;margin-top:20px}