.photo {
  position: relative;
  white-space: nowrap;
}
.photo img {
  background-color: rgba(0, 0, 255, 0.25); /*blue*/
  bottom: 133%;
  display: none; /*hide*/
  padding: 5px;
  position: absolute;
  right: 0;
  z-index: 3;
}
.photo:hover img {
  display: block; /*show*/
  white-space: nowrap;
}