opacity: 1;
  }
  #help dialog {
      max-width: 400px;
      text-align: justify;
  }
</style>
<body>
  <div id='help'>
    <div onclick='document.querySelector("#help > dialog").showModal()' id='help-contents'>?</div>
    <dialog>
      <h3>Help</h3>
      The screen divides in two:
      <ul>
        <li>on the upper part, there is the list of the different phases that were applied;</li>
        <li>on the lower part, the "rustish" code of the selected phase is displayed.</li>
      </ul>
      <p>
    