body {
    display: flex;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
  }
  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #343a40;
    color: white;
    padding: 10px 20px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
  }
  .sidebar {
    width: 250px;
    height: calc(100vh - 56px); /* Adjust height to exclude header */
    position: fixed;
    top: 56px;
    background-color: #343a40;
    color: white;
  }
  .sidebar a {
    text-decoration: none;
    color: white;
    display: block;
    padding: 10px;
  }
  .sidebar a.active, .sidebar a:hover {
    background-color: #495057;
  }
  .content {
    margin-left: 250px;
    margin-top: 56px; /* Offset for header */
    padding: 20px;
    width: calc(100% - 250px);
  }
  .breadcrumb {
    padding: 10px 15px;
    border-radius: 0.25rem;
    margin-bottom: 20px;
  }
  .stats {
    display: flex;
    gap: 20px;
    align-items: start;
  }
  .stat-card {
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    flex: 1;
  }
  .charts {
    margin-top: 40px;
  }

  /* Wrapper layout */
.wrapper {
    display: flex;
    min-height: 100vh;
  }

  /* Main content styling */
.content {
    padding: 20px;
    flex-grow: 1;
    overflow-x: auto;
  }
  
  h1 {
    margin-bottom: 20px;
  }
  
  #bookTable {
    width: 100%;
    margin-top: 20px;
  }

  #addBookBtn {
    display: inline-block;
  }
  
  .deleteBookBtn {
    color: white;
    font-size: 12px;
  }