.img-container {
  position: relative;
  margin: auto;
}

.img {
  max-height: 180px;
  max-width: 170px;
}
.img-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgb(0, 0, 0);
  background: rgba(0, 0, 0, 0.5); /* Black see-through */
  overflow: hidden;
  width: 100%;
  height: 0;
  transition: 0.5s ease;
}

.img-container:hover .img-overlay {
  height: 20%;
}

.img-text {
  white-space: nowrap;
  color: white;
  font-size: 20px;
  position: absolute;
  overflow: hidden;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

@media only screen and (max-width: 600px) {
  div .img {
    max-height: 130px;
    max-width: 130px;
  }
  div .img-overlay {
    margin: auto;
    width: 95%;
  }

  div .img-text {
    font-size: 15px;
  }
}