mixin-heavy-style.scss

@include archive(exhibition) {
  @include and-card(regular-archive) {
    @include full-width;
    @include meta-margin-small;
    @include float-grid(post, 33%);
    @include green-background;
    @extend %expandable-archive;

    .posts {
      @include animated-height;
    }

    # ...
  }

  @include and-card(upcoming-archive) {
    @include simple-archive;
  }
}