inline-animation.scss

@mixin inline-animation($duration) {
  $name: inline-#{unique-id()};

  @keyframes #{$name} {
    @content;
  }

  animation-name: $name;
  animation-duration: $duration;
  animation-iteration-count: infinite;
}

.pulse {
  @include inline-animation(2s) {
    from { background-color: yellow }
    to { background-color: red }
  }
}