.overlay {
    display: none; /* Hidden by default */
    position: fixed;
    justify-content: center; /* Center horizontally */
    align-items: center; /* Center vertically */
    top: 0; /* Below the header */
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 10000;
}
#scroll-to-top {
    display: none;
    position: fixed;
    bottom: 80px;
    right: 15px;
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 5px;
    border-radius: 5px;
    cursor: pointer;
}