dvn-rich-editor-heading-block {
  display: block;
  flex: 1;
}
dvn-rich-editor-heading-block h1 {
  font-size: 2rem;
  margin: 0;
  display: block;
}
dvn-rich-editor-heading-block h2 {
  font-size: 1.6rem;
  margin: 0;
  display: block;
}
dvn-rich-editor-heading-block h3 {
  font-size: 1.2rem;
  margin: 0;
  display: block;
}