just-the-docs/_sass/utilities/_typography.scss

.fs-1 {
  @include fs-1;
}

.fs-2 {
  @include fs-2;
}

.fs-3 {
  @include fs-3;
}

.fs-4 {
  @include fs-4;
}

.fs-5 {
  @include fs-5;
}

.fs-6 {
  @include fs-6;
}

.fs-7 {
  @include fs-7;
}

.fs-8 {
  @include fs-8;
}

.fs-9 {
  @include fs-9;
}

.fs-10 {
  @include fs-10;
}

.fw-300 {
  font-weight: 300 !important;
}

.fw-400 {
  font-weight: 400 !important;
}

.fw-500 {
  font-weight: 500 !important;
}

.fw-700 {
  font-weight: 700 !important;
}