/* roulang page: index */
body { font-family: sans-serif; margin: 0; padding: 0; }
        header { background-color: #f0f0f0; padding: 20px; text-align: center; }
        section { padding: 20px; }
        footer { background-color: #333; color: white; text-align: center; padding: 10px; position: fixed; bottom: 0; width: 100%; }
        /* Simple layout for demonstration */
        .container { max-width: 960px; margin: 0 auto; }
        .feature { margin-bottom: 20px; border: 1px solid #ddd; padding: 10px; }
        .button { background-color: #4CAF50; border: none; color: white; padding: 10px 20px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; border-radius: 5px; }