article a.link-overlay {
  position: absolute;
  top: 0;
  height: 100%;
  width: 100%;
}
article .link-overlay {
  background: rgba(0, 0, 0, 0.4);
}
article a.link-overlay:hover {
  background: rgba(0, 0, 0, 0.6);
  -webkit-transition: all 0.2s ease-in-out;
  -moz-transition: all 0.2s ease-in-out;
  -ms-transition: all 0.2s ease-in-out;
  -o-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
}