body {
      font-family: Arial, sans-serif;
      background-color: #f4f4f4;
      margin: 0;
      padding: 0;
      color: #333;
    }
    header {
      background-color: #003366;
      color: white;
      padding: 20px;
      text-align: center;
    }
    section {
      margin: 20px;
      padding: 20px;
      background-color: #fff;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
    }
    h1, h2, h3 {
      color: #003366;
    }
    code, pre {
      background-color: #282c34;
      color: white;
      padding: 10px;
      border-radius: 4px;
      overflow-x: auto;
      display: block;
    }
    table {
      border-collapse: collapse;
      width: 100%;
    }
    th, td {
      padding: 10px;
      border: 1px solid #ccc;
    }