ble Bootstrap tooltips
    (function () {
      const tooltipTriggerList = document.querySelectorAll('[data-bs-toggle="tooltip"]')
      const tooltipList = [...tooltipTriggerList].map(tooltipTriggerEl => new bootstrap.Tooltip(tooltipTriggerEl))
    })();
  </script>

  </div>
  
  <div class="row">
    <div class="col-md-3 hidden-xs hidden-sm visible-md visible-lg">
      <div id="sidebar">
      <h3>Contents</h3>
  
      <div class="card mb-4">
      <a data-bs-toggle="collapse" href="#vars-0"
         a