body {
    font-family: Arial, sans-serif;
    margin: 20px;
    padding: 0;
    background: #f4f4f4;
}

h1 {
    color: #333;
}

#captchaContainer {
    margin-top: 20px;
}

.captchaBlock {
    background: white;
    border: 1px solid #ccc;
    padding: 10px;
    margin-bottom: 10px;
}

.imageList {
    margin: 10px 0;
}

.imageList img {
    width: 100px;
    margin-right: 10px;
    border: 1px solid #ddd;
}

button {
    cursor: pointer;
    padding: 10px 20px;
    margin-top: 10px;
    background: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
}

button:hover {
    background: #0056b3;
}

.selected {
    border: 2px solid red;
}
