#it-region-content div.node__content a[href^="http"]::after {
    content: "";
    display: inline-block;
    width: 15px;
    height: 15px;
    background-image: url("/themes/custom/italiagov/assets/images/external-link.png");
    background-repeat: no-repeat;
    margin-left: 5px;
    margin-right: 5px;
    background-size: 15px;
  }