#img {
    position: absolute;
    width: 592px; /*image width */
    height: 512px; /*image height */
    left: 50%;
    top: 50%;
    margin-left: -296px; /*image width/2 */
    margin-top: -256px; /*image height/2 */
}

.align-content-center {
    align-content: center;
}