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

img {
  width: 100px;
  margin-top: 200px;
  margin-left: 20px;
}

img:hover {
  animation: .8s infinite beatHeart;
  -webkit-transition: background-color 1000ms ease-in;
  background-color: pink;
  border-radius: 10%;
}


@keyframes beatHeart {
  0% {
    transform: scale(1);
  }
  25% {
    transform: scale(1.1);
  }
  40% {
    transform: scale(1);
  }
  60% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}