notes/_sass/support/mixins/_typography.scss

@mixin fs-1 {
  font-size: $font-size-1 !important;

  @include mq(sm) {
    font-size: $font-size-1-sm !important;
  }
}

@mixin fs-2 {
  font-size: $font-size-2 !important;

  @include mq(sm) {
    font-size: $font-size-3 !important;
  }
}

@mixin fs-3 {
  font-size: $font-size-3 !important;

  @include mq(sm) {
    font-size: $font-size-4 !important;
  }
}

@mixin fs-4 {
  font-size: $font-size-4 !important;

  @include mq(sm) {
    font-size: $font-size-5 !important;
  }
}

@mixin fs-5 {
  font-size: $font-size-5 !important;

  @include mq(sm) {
    font-size: $font-size-6 !important;
  }
}

@mixin fs-6 {
  font-size: $font-size-6 !important;

  @include mq(sm) {
    font-size: $font-size-7 !important;
    line-height: $body-heading-line-height;
  }
}

@mixin fs-7 {
  font-size: $font-size-7 !important;
  line-height: $body-heading-line-height;

  @include mq(sm) {
    font-size: $font-size-8 !important;
  }
}

@mixin fs-8 {
  font-size: $font-size-8 !important;
  line-height: $body-heading-line-height;

  @include mq(sm) {
    font-size: $font-size-9 !important;
  }
}

@mixin fs-9 {
  font-size: $font-size-9 !important;
  line-height: $body-heading-line-height;

  @include mq(sm) {
    font-size: $font-size-10 !important;
  }
}

@mixin fs-10 {
  font-size: $font-size-10 !important;
  line-height: $body-heading-line-height;

  @include mq(sm) {
    font-size: $font-size-10-sm !important;
  }
}