<div class="pixels">
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
  <div class="px"></div>
</div>

.pixels {
  display: grid;
  grid-template-columns: repeat(4, 12px);
  gap: 4px;
}
.px {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: #7c6cff;
  animation: px 1.4s ease-in-out infinite;
}
.px:nth-child(1) {
  animation-delay: 0s;
}
.px:nth-child(2) {
  animation-delay: 0.1s;
}
.px:nth-child(3) {
  animation-delay: 0.2s;
}
.px:nth-child(4) {
  animation-delay: 0.3s;
}
.px:nth-child(5) {
  animation-delay: 0.4s;
}
.px:nth-child(6) {
  animation-delay: 0.5s;
}
.px:nth-child(7) {
  animation-delay: 0.6s;
}
.px:nth-child(8) {
  animation-delay: 0.7s;
}
.px:nth-child(9) {
  animation-delay: 0.8s;
}
.px:nth-child(10) {
  animation-delay: 0.9s;
}
.px:nth-child(11) {
  animation-delay: 1s;
}
.px:nth-child(12) {
  animation-delay: 1.1s;
}
.px:nth-child(13) {
  animation-delay: 1.2s;
}
.px:nth-child(14) {
  animation-delay: 1.3s;
}
.px:nth-child(15) {
  animation-delay: 0.65s;
}
.px:nth-child(16) {
  animation-delay: 0.85s;
}
@keyframes px {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0;
    transform: scale(0.3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .pixels,
  .pixels * {
    animation: none !important;
  }
}