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[Don]

Here is my implementation! It perfectly fits my forum’s subject. Thanks @Don

.first-replier.--image {
  animation: 2s batteryFade infinite;
}

@keyframes batteryFade {
  0% {
    opacity: 0.3;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.3;
  }
}