.container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        h1, h2, h3 {
            color: #333;
        }
        ul {
            list-style-type: none;
        }
        ul li {
            margin-bottom: 10px;
        }
        .content-section {
            margin-bottom: 40px;
        }
        .intro {
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
        }
        .directory {
            background-color: #fff;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
        }
        .directory ul {
            padding-left: 20px;
        }
        .directory ul li a {
            color: #0073e6;
            text-decoration: none;
        }
        .directory ul li a:hover {
            text-decoration: underline;
        }