title: How to add a distinct scroll bar for a left menu inside my page
body: <p>I am trying to add a scroll bar to the searchable menu on the left that is <strong>fixed</strong> as it must only scroll for its own items.</p>
  
  <p>This scroll must be specific to this left menu and must NOT scroll the actual main page content:</p>
  
  <p>Please find a <a href="https://i.stack.imgur.com/xaMC0.png" rel="nofollow noreferrer">screenshot</a> of the page with its left menu.</p>