#preloader {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity .25s ease-out;
}
#preloader.hidden {
    opacity: 0;
    pointer-events: none;
}
#preloader-logo {
    filter: grayscale(100%);
}