img {
    position: absolute;
    top: 0; bottom:0; left: 0; right:0;
    margin: auto;
}

@media screen and (orientation: portrait) {
    img {
        max-width: 90%;
    }
  }
  
@media screen and (orientation: landscape) {
    img {
        max-height: 90%;
    }
}

.padding-bottom {
    padding-bottom: 20px;
}