body {
    font-family: sans-serif;
    padding: 20px;
    line-height: 1.6;
}
.question {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.correct {
    color: green;
    font-weight: bold;
}
.wrong {
    color: red;
    text-decoration: line-through;
}
button {
    padding: 10px 20px;
    cursor: pointer;
}

input[type="radio"]:disabled { 
    cursor: not-allowed;
}