How can HTML and CSS affect the output of PHP echo statements?

When using PHP echo statements to output content on a webpage, the HTML and CSS can affect how the content is displayed. For example, if the output is wrapped in HTML tags, the styling from CSS will be applied to the content. To ensure the output is displayed correctly, you may need to consider the HTML structure and CSS styling when using PHP echo statements.

<?php
echo "<div class='content'>Hello, World!</div>";
?>