body {
     font-family: Arial, sans-serif;
     max-width: 700px;
     margin: auto;
     padding: 20px;
}
 input, select, button {
     padding: 5px;
     margin: 5px 0;
}
 .result {
     background: #f0f0f0;
     padding: 10px;
     margin: 10px 0;
     border-radius: 5px;
}
 .correct {
     color: green;
     font-weight: bold;
}