.image-holder img {
  /* max-width: 100%; height: auto; */
}
.image-holder.centered {
  position: relative;
  text-align: center;
  vertical-align: middle;
  line-height: 0;
}
.image-holder.centered img {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}