HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title>Toggle sidebar</title>

  <style>

    body { font-family: system-ui, sans-serif; padding: 1.5rem; }

    #sidebar {

      display: none;

      margin-top: 1rem;

      padding: 1rem;

      background: #eff6ff;

      border: 1px solid #93c5fd;

      border-radius: 0.5rem;

      max-width: 14rem;

    }

    #sidebar.open { display: block; }

  </style>

</head>

<body>

  <button type="button" id="menu-btn">Toggle menu</button>

  <div id="sidebar">Sidebar content</div>



  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $(function () {

      $("#menu-btn").on("click", function () {

        $("#sidebar").toggleClass("open");

      });

    });

  </script>

</body>

</html>

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