@keyframes dot-pulse {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1);
  }
  100% {
    transform: scale(0);
  }
}
.dot {
  width: 12px;
  height: 12px;
  background-color: green;
  border-radius: 50%;
  animation: dot-pulse 1.2s ease both infinite;
  margin: 0 8px;
}

.dot--one {
  animation-delay: 0;
}
.dot--two {
  animation-delay: 0.3s;
}
.dot--three {
  animation-delay: 0.6s;
}
.dot--four {
  animation-delay: 0.9s;
}