#spinner {
    position: fixed;
    top: 0px;
    left: 0px;
    min-height: 100%;
    min-width: 100%;
    z-index: 10000;
    background-color: rgba(0, 0, 0, 0.2);
}

    #spinner > img {
        position: absolute;
        z-index: 10001;
        transform: translateY(-50%);
        width: 10em;
        height:auto;
    }