.pulse::before {
  content: "";
  position: absolute;
  border: 1px solid #999;
  left: -20px;
  right: -20px;
  top: -20px;
  bottom: -20px;
  border-radius: 50%;
  animation: pulse 1.8s linear infinite;
}
.rotate {
  animation: phone 1.9s ease-in-out infinite;
}
@keyframes pulse {
  0% {
    transform: scale(0.5);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
  }
}
.pulse::after {
  animation-delay: 0.5s;
}
@keyframes phone {
  0%,
  100% {
    transform: rotate(-20deg);
  }
  50% {
    transform: rotate(21deg);
  }
}