demarches-normaliennes/app/assets/stylesheets/custom_mails.scss

#custom-mails {
  padding: 20px;

  .wrapper {
    background-color: #FFFFFF;
    box-shadow: 0 0 1px 0 rgba(0, 0, 0, 0.5);
    margin: 15px auto;
    max-width: 800px;
    padding: 20px;
  }
}