<!-- BEGIN COPY / PASTE -->
    <style>
      .sidebar {
        width: 250px;
        height: 100vh;
        background-color: #333;
        position: fixed;
        top: 0;
        left: -250px;
        transition: left 0.3s ease;
      }
      .sidebar.open {
        left: 0;
      }
      .toggle-btn {
        position: absolute;
        top: 20px;
        left: 20px;
        cursor: pointer;
      }
    </style>
    <div class="sidebar" id="sidebar">
      <p>Sidebar content here</p>
    </div>
    <button class="toggle-btn" onclick="toggleSidebar()">Toggle Sidebar</button>
    <script>
      function toggleSidebar() {
        document.getElementById('sidebar').classList.toggle('open');
      }
    </script>
    <!-- END COPY / PASTE -->