src/animations/ball-pulse.scss

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

@keyframes scale {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  45% {
    transform: scale(0.1);
    opacity: 0.7;
  }
  80% {
    transform: scale(1);
    opacity: 1;
  }
}

// mixins should be separated out
@mixin ball-pulse($n: 3, $start: 1) {
  @for $i from $start through $n {
    > div:nth-child(#{$i}) {
      animation: scale 0.75s delay(0.12s, $n, $i) infinite cubic-bezier(.2,.68,.18,1.08);
    }
  }
}

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

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

    display: inline-block;
  }
}