.appstore-button-link {
  display: inline-block;
  position: relative;
  cursor: pointer;
  text-decoration: none;
}

.appstore-img {
  height: 60px;
  display: block;
  transition: opacity 0.3s ease;
}

.appstore-img-black {
  opacity: 1;
}

.appstore-img-white {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}

.appstore-button-link:hover .appstore-img-black {
  opacity: 0;
}

.appstore-button-link:hover .appstore-img-white {
  opacity: 1;
}