span.preloader-img {
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background: rgba(255,255,255,0.8);
}

span.preloader-img > img{
    position: absolute;
    width: 50px;
    height: 50px;
    left: 50%;
    top: 50% !important;
    transform: translateY(-50%) translateX(-50%) !important;
}

.load-img{
    opacity: 0;
}