.preloader {
    background-color: #fff;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1000;
}
.preloader__loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%)
}