header {
    text-align: center;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

footer {
    text-align: center;
    margin-top: 20px;
}  

#captcha-answer {
    margin: 8px 0;
    padding: 6px 8px;
    width: 110px;
}

#captcha-feedback {
    min-height: 1.2em;
    margin: 6px 0 10px;
    font-size: 0.95rem;
}