Are there any best practices for including content with PHP to maintain consistent styling across different elements?

When including content with PHP, it's important to maintain consistent styling across different elements to ensure a cohesive design. One best practice is to use a separate CSS file to define styles and include it in the header of your HTML document. This way, all elements included with PHP will inherit the same styles, helping to maintain consistency.

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
    <?php include 'content.php'; ?>
</body>
</html>