@mixin dirty {
  opacity: 0.5;
	transition: 0.5s;
}

@keyframes clean {
  from { @include dirty }
  to { opacity: 1 }
}

.dirty, {
	@include dirty;
}

.clean {
	animation: 0.2s clean;
}

@mixin dirty {
  opacity: 0.5;
	transition: 0.5s;
}

@keyframes clean {
  from { @include dirty }
  to { opacity: 1 }
}

.dirty, { @include dirty }
.clean { animation: 0.2s clean }

Use more consistent curly bracket placement
Use more consistent curly bracket placement
