body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f4f4;
            color: #333;
        }
        header {
            background-color: #004466;
            color: white;
            padding: 20px;
            text-align: center;
        }
        nav ul {
            list-style: none;
            padding: 0;
        }
        nav ul li {
            display: inline;
            margin: 0 15px;
        }
        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: bold;
        }
        section {
            padding: 20px;
            margin: 20px;
            background: white;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.6s ease-out;
        }
        section.visible {
            opacity: 1;
            transform: translateY(0);
        }
        button {
            background-color: #004466;
            color: white;
            padding: 10px 15px;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        button:hover {
            background-color: #002233;
        }
        footer {
            background-color: #004466;
            color: white;
            text-align: center;
            padding: 10px;
            margin-top: 20px;
        }