/*-------------------------------------------------- mail-setting --*/
#mail_settings .mail_settings_introduction {
  margin-bottom: 3.75rem;
  line-height: 1.8;
}
#mail_settings .mail_settings_subtitle {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 2rem;
}
#mail_settings .mail_settings_supplement {
  margin-top: 0.5rem;
}