body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color:#fff;
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    -webkit-transition: opacity 1.5s ease;
    transition: opacity 1.5s ease;
}

body.fadeout::after {
    opacity: 1;
}