.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);
    }
  }