body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f8f8f8;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .wrapper {
            width: 100%;
            max-width: 1200px;
        }
        header {
            background-color: #2c3e50;
            color: white;
            padding: 10px 20px;
            text-align: center;
        }
        header h1 {
            margin: 0;
        }
        nav {
            display: flex;
            justify-content: center;
            background-color: #34495e;
            padding: 10px;
        }
        nav a {
            color: white;
            margin: 0 15px;
            text-decoration: none;
            font-size: 16px;
        }
        .banner {
            background-image: url('petr1.jpg');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: 100px 20px;
        }
        .banner h2 {
            margin: 0;
            font-size: 36px;
        }
        .banner p {
            font-size: 18px;
            margin: 10px 0 20px;
        }
        .banner .cta-button {
            background-color: #e74c3c;
            color: white;
            padding: 15px 30px;
            text-decoration: none;
            font-size: 18px;
            border-radius: 5px;
        }
        .container {
            padding: 20px;
        }
        .content {
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 20px;
        }
        .content .card {
            background-color: white;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 5px;
            width: 45%;
            padding: 20px;
            text-align: center;
            box-sizing: border-box;
        }
        .content .card img {
            max-width: 100%;
            border-radius: 5px;
        }
        .content .card h3 {
            margin: 15px 0;
        }
        footer {
            background-color: #2c3e50;
            color: white;
            text-align: center;
            padding: 20px;
            width: 100%;
            box-sizing: border-box;
        }

        @media (max-width: 768px) {
            .banner {
                padding: 50px 20px;
            }
            .banner h2 {
                font-size: 24px;
            }
            .banner p {
                font-size: 16px;
            }
            .banner .cta-button {
                padding: 10px 20px;
                font-size: 16px;
            }
            .content .card {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            nav {
                flex-direction: column;
            }
            nav a {
                margin: 5px 0;
            }
        }