title: How to set Helvetica font?
body: <p>How to set Helvetica font?</p>
  
  <p>I add css:</p>
  
  <pre><code>body
  {
      font-family: Helvetica, Sans-Serif;
      color: #444444;
      font-size: 9pt;
      background-color: #FAFAFA;
  }
  </code></pre>
  
  <p>but in Mozilla I see <code>MS shell dlg</code> font.</p>
  
  <p>Why is this happens and how will repair it?
  <img src="https://i.stack.imgur.com/ev5pH.png" alt="enter image description here"></p>
  
  <p><strong>Update:</strong></p>
  
  <p>I set Arial but in Mozilla I see <code>MS shell dlg</code> again.<img src="https://i.stack.imgur.com/i0KTp.png" alt="enter image description here"></p>