.loader {
  position: relative;
  width: 40px;
  height: 60px;
  animation: heartBeat 1.2s infinite cubic-bezier(0.215, 0.61, 0.355, 1);
}

.loader:before,
.loader:after {
  content: "";
  background: red;
  width: 40px;
  height: 60px;
  border-radius: 50px 50px 0 0;
  position: absolute;
  left: 0;
  bottom: 0;
  transform: rotate(45deg);
  transform-origin: 50% 68%;
  box-shadow: 5px 4px 5px #0004 inset;
}
.loader:after {
  transform: rotate(-45deg);
}
@keyframes heartBeat {
  0% {
    transform: scale(0.95);
  }
  5% {
    transform: scale(1.1);
  }
  39% {
    transform: scale(0.85);
  }
  45% {
    transform: scale(1);
  }
  60% {
    transform: scale(0.95);
  }
  100% {
    transform: scale(0.9);
  }
}