* {
  margin: 0;
  padding: 0;
}

.container {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icons a {
  display: inline-flex;
  width: 100px;
  height: 100px;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 40px;
  margin: 10px;
  box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
  background-size: 100% 200%;
  background-position: 0% 5%;
  transition: background-position 0.5s, color 0.5s;
}

.icons a:nth-child(1) {
  color: #1976d3;
  background-image: linear-gradient(#fff 50%, #1976d3 50%);
}

.icons a:nth-child(2) {
  color: #db6f44;
  background-image: linear-gradient(#fff 50%, #db6f44 50%);
}

.icons a:nth-child(3) {
  color: #000;
  background-image: linear-gradient(#fff 50%, #000 50%);
}

.icons a:nth-child(4) {
  color: #03a9f5;
  background-image: linear-gradient(#fff 50%, #03a9f5 50%);
}

.icons a:hover {
  background-position: 0% 100%;
  color: #fff;
}