#scrollTopButton {
    opacity: 0;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    padding: 0;
    background-color: var(--secondary-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: opacity 0.5s ease, transform 0.5s ease;
    pointer-events: none; /* Disable clicking when invisible */
}

#scrollTopButton:hover {
    background-color: var(--tertiary-color);
}

#scrollTopButton.visible {
    opacity: 1;
    pointer-events: auto; /* Re-enable clicking when visible */
}