.logo-img {
      height: 50px;
      margin-bottom: 20px;
  }

  .sidebar {
      height: 100vh;
      background-color: #FFC107;
      color: white;
      padding: 1rem;
      position: fixed;
      width: 220px;
      transition: all 0.3s;
      z-index: 1000;
      /* for Panel name */
      display: flex;
      flex-direction: column;
      justify-content: space-between;
  }

  .sidebar a {
      color: white;
      text-decoration: none;
      display: block;
      margin: 0.6rem 0;
  }

  .sidebar a:hover {
     color: #3f51b5;
  }

  .sidebar-footer {
      font-size: 0.875rem;
      background-color: rgba(255, 255, 255, 0.05);
      border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .main-content {
      margin-left: 220px;
      transition: all 0.3s;
  }

  .sidebar.collapsed {
      margin-left: -220px;
  }

  .main-content.expanded {
      margin-left: 0;
  }

  .topbar {
      background-color: #ffffff;
      border-bottom: 1px solid #dee2e6;
      padding: 1rem;
      position: sticky;
      top: 0;
      z-index: 999;
  }

  .toggle-btn {
      font-size: 1.25rem;
      cursor: pointer;
      margin-right: 1rem;
  }

  .course-title-box {
      background: linear-gradient(135deg, #3f51b5, #f4df9c);
      width: 100%;
      text-decoration: none;
  }

  .badge-topic {
      background-color: #e9f5ff;
      color: #007bff;
      margin: 3px;
      font-size: 0.75rem;
  }

  @media (max-width: 768px) {
      .sidebar {
          margin-left: -220px;
      }

      .sidebar.show {
          margin-left: 0;
      }

      .main-content {
          margin-left: 0;
      }

      .mb-0{
        font-size: medium;
      }

  }