#age-calculator {
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
}

#birth-date {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}

#calculate-age {
    padding: 10px 20px;
    background-color: #0073aa;
    color: #fff;
    border: none;
    cursor: pointer;
}

#calculate-age:hover {
    background-color: #005177;
}

#loading-indicator {
    margin-top: 10px;
    font-size: 14px;
    color: #0073aa;
}

#age-result {
    margin-top: 20px;
    font-size: 16px;
}