.footer {
    text-align: center;
    align-items: center;
    width: 100%;
    height: 40px;
    position: absolute;
    bottom: 0;
    left: 0;
    color: #000;
    font-size: 20px;
}

footer {
    background-color: <?= htmlspecialchars($currentBgColor) ?>;
    padding: 20px 0;
    text-align: center;
    min-height: 60px;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40px; 
}