What are some best practices for maintaining consistency in layout when integrating external content into a PHP website?

When integrating external content into a PHP website, it's important to maintain consistency in layout to ensure a seamless user experience. One way to achieve this is by using CSS to style the external content to match the rest of the website. By defining specific classes for the external content and applying consistent styling, you can ensure that the layout remains cohesive.

<style>
    .external-content {
        /* Define styling properties for the external content */
        font-family: Arial, sans-serif;
        color: #333;
        padding: 10px;
        border: 1px solid #ccc;
    }
</style>

<div class="external-content">
    <?php
    // Code to fetch and display external content here
    ?>
</div>