html:lang(fa) {
  html,
  body {
    font-family: "B Nazanin Fa Num", "Noto Serif", -apple-system,
      BlinkMacSystemFont, FontAwesome, "Segoe UI", "Roboto", "Oxygen-Sans",
      "Ubuntu", "Cantarell", "Helvetica Neue", sans-serif;
    line-height: 2;
  }

  body * {
    font-family: "B Nazanin Fa Num", "Montserrat", -apple-system,
      BlinkMacSystemFont, FontAwesome, "Segoe UI", "Roboto", "Oxygen-Sans",
      "Ubuntu", "Cantarell", "Helvetica Neue", sans-serif !important;
  }
}