body {
    font-family: Arial, sans-serif;
  }
  .nav-link.active {
    background-color: #ddd;
    border-radius: 20px;
  }
  .breadcrumb {
    background-color: transparent;
    padding: 0;
    font-size: 0.9rem;
  }
  .author {
    font-size: 0.9rem;
    color: #666;
  }
  .sidebar .list-group-item {
    border: none;
    padding: 10px 0;
    font-size: 0.9rem;
  }
  .sidebar .list-group-item img {
    width: 60px;
    height: auto;
    margin-right: 10px;
  }