Generated content 

.tile::before {
  content: "";
  background-color: #333;
  position: absolute;
  top: 90px;
  left: 155px;
  width: 0;
  height: 20px;
  z-index: 3;
}

.tile:target::before {
  width: 110px;
  transition: width 0.9s;
}