/* Show/hide 'Back to top' button on pages with long file lists or other content */
#topButton {
    display: none;    /* Hidden by default */
    position: fixed;  /* Fixed/sticky position */
    bottom: 20px;     /* Place the button at the bottom of the page */
    right: 30px;      /* Place the button 30px from the right */
    z-index: 99;      /* Make sure it does not overlap */
}