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.hover-me a {
  position: relative;
  z-index: 9;
}

.hover-me a:after {
  content: '+';
  color: #474D55;
  position: absolute;
  text-align: center;
  width: 100%;
  height: 100%;
  font-size: 30px;
  line-height: 115px;
  background-color: rgba(255, 255, 255, 0.56);
  z-index: 10;
  left: 0;
  top: 0;
  opacity: 0;
}

.hover-me a:hover:after {
  line-height: 75px;
  opacity: 1;
}