img {
  position: absolute;
  top: 8px;
  right: 16px;
  }

.container {
  position: relative;
  width: 100%;
}


.overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100%;
  width: 100%;
  opacity: 0;
  transition: .5s ease;
  background-color: #008CBA;
}

.container:hover .overlay {
  opacity: 1;
}