<nav class="navbar navbar-expand-lg fixed-top" id="mainNav"></nav>
    <script>
      $(function () {
        $("#mainNav").load("../html_chunk/menu.html");
      });
    </script>

    <!-- THIS ALLOWS TO INSERT THE MODAL OF THE MENU THAT IS STORED IN A MENU_MODAL.HTML FILE-->
    <div id="modal_menu_insertion"></div>
    <script>
      $(function () {
        $("#modal_menu_insertion").load("../html_chunk/menu_modal.html");
      });
    </script>

    <!-- Header -->
    <header class="masthead">
      <