.rich-text-width-xn {
  margin-left: auto;
  margin-right: auto;
  max-width: 30rem;
}
.rich-text-width-n {
  margin-left: auto;
  margin-right: auto;
  max-width: 50rem;
}
.rich-text-width-m {
  margin-left: auto;
  margin-right: auto;
  max-width: 70rem;
}