<div class="flex justify-center my-20 space-x-3">
  <div class="animate-ping  h-2 w-2 bg-blue-600 rounded-full animation-delay-500"></div>
  <div class="animate-ping  h-2 w-2 bg-blue-600 rounded-full"></div>
  <div class="animate-ping  h-2 w-2 bg-blue-600 rounded-full animation-delay-500"></div>
</div>

.animation-delay-500 {
  animation-delay: 0.5s;
}