#spinner {
    opacity: 0;
    visibility: hidden;

    transition:
        opacity .5s ease-out,
        visibility 0s linear .5s;

    z-index: 99999;
}

#spinner.show {
    visibility: visible;
    opacity: 1;

    transition:
        opacity .5s ease-out,
        visibility 0s linear 0s;
}