body {
  text-align: center;
}

.item {
  margin: 5px;
  width: 20vw;
  height: 40vh;
  transition: .3s all;
  display: inline-block;
  position: relative;
  z-index: 1;
  line-height: 14px;
}

.item:hover {
  box-shadow: 0 10px 30px #000;
  z-index: 2;
}


.item:after {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background-color: orange;
  transition: .3s all;
  z-index: -1;
  transform: scale(1);
}



.item:hover:after {
  transform: scale(1.1);
}