src/animations/ball-pulse-sync.scss

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@import '../variables';
@import '../mixins';
@import '../functions';

$amount: 10px;

@keyframes ball-pulse-sync {
  33% {
    transform: translateY($amount);
  }
  66% {
    transform: translateY(-$amount);
  }
  100% {
    transform: translateY(0);
  }
}

@mixin ball-pulse-sync($n: 3, $start: 1) {
  @for $i from $start through $n {
    > div:nth-child(#{$i}) {
      animation: ball-pulse-sync 0.6s delay(0.07s, $n, $i) infinite ease-in-out;
    }
  }
}

.ball-pulse-sync {
  @include ball-pulse-sync();

  > div {
    @include balls();
    @include global-animation();

    display: inline-block;
  }
}