src/animations/ball-zig-zag.scss

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

$amount: 30px;

@keyframes ball-zig {
  33% {
    transform: translate(-$amount/2, -$amount);
  }
  66% {
    transform: translate($amount/2, -$amount);
  }
  100% {
    transform: translate(0, 0);
  }
}

@keyframes ball-zag {
  33% {
    transform: translate($amount/2, $amount);
  }
  66% {
    transform: translate(-$amount/2, $amount);
  }
  100% {
    transform: translate(0, 0);
  }
}

.ball-zig-zag {
  position: relative;
  transform: translate(-$amount / 2, -$amount / 2);

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

    position: absolute;
    margin-left: $amount / 2;
    top: 4px;
    left: -7px;

    &:first-child {
      animation: ball-zig 0.7s 0s infinite linear;
    }

    &:last-child {
      animation: ball-zag 0.7s 0s infinite linear;
    }
  }
}