.heart {
  height: 70px;
  width: 70px;
  background: #f20044;
  transform: rotate(-45deg);
  box-shadow: -10px -10px 90px #f20044;
  animation: anim 0.6s linear infinite;
}

@keyframes anim {
  0% {
    transform: rotate(-45deg) scale(1.07);
    filter: blur(0px);
  }
  80% {
    transform: rotate(-45deg) scale(1);
    filter: blur(1px);
  }
  100% {
    transform: rotate(-45deg) scale(0.8);
    filter: blur(2px);
  }
}

.heart:before {
  content: "";
  position: absolute;
  height: 70px;
  width: 70px;
  background: #f20044;
  top: -50%;
  border-radius: 50px;
}
.heart:after {
  content: "";
  position: absolute;
  height: 70px;
  width: 70px;
  background: #f20044;
  right: -50%;
  border-radius: 50px;
}