Step 2: CSS to place text on images

style.css

span.text-content {
  background: rgba(0,0,0,0.5);
  color: white;
  cursor: pointer;
  display: table;
  height: 150px;
  left: 0;
  position: absolute;
  top: 0;
  width: 150px;
}

span.text-content span {
  display: table-cell;
  text-align: center;
  vertical-align: middle;
}