.heading {
  @include m(xs) {
    @include fontSize($font-heading-xs);
  }

  @include m(sm) {
    @include fontSize($font-heading-sm);
  }

  @include m(base) {
    @include fontSize($font-heading-base);
  }

  @include m(lg) {
    @include fontSize($font-heading-lg);
  }
}