#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
}

#preloader.hide-preloader {
    animation: hidePreloader 1s;
}

#preloader.preloader-hidden {
    display: none;
}

@keyframes hidePreloader {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}