#document-loader {
    text-align: center;
}

#document-loader img {
    width: 50px;
    height: 50px;
    /*position: absolute;*/
    top: 50%;
    left: 50%;
    /*margin-left: -50px;*/
    /*margin-top: -50px;*/
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}


@-webkit-keyframes spin {
    to {
        -webkit-transform: rotate(1turn)
    }
}

@keyframes spin {
    to {
        transform: rotate(1turn)
    }
}