img {
    max-width: 100%;
    max-height: 100%;
    bottom: 0;
    left: 0;
    margin: auto;
    overflow: auto;
    position: fixed;
    right: 0;
    top: 0;
    -o-object-fit: contain;
    object-fit: contain;
}

img2 {
  position: fixed; 
  top: 0; 
  left: 0; 
	
  /* Preserve aspet ratio */
  min-width: 100%;
  min-height: 100%
}