.external-link::after {
  content: "↗";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  margin-left: 6px;
  margin-right: 6px;
  font-size: 10px;
  border: 1px solid currentColor;
  border-radius: 3px;
}

.external-link {
  text-decoration: underline;
}