a[href^="http://"]:not([href*="beone-stuttgart.de"]):after,
a[href^="https://"]:not([href*="beone-stuttgart.de"]):after {
  content: "\f08e";
  font-family: FontAwesome;
  font-weight: normal;
  font-style: normal;
  display: inline-block;
  text-decoration: none;
  padding-left: 3px;
}