What are some common reasons for a white background flash during a PHP site refresh?

The white background flash during a PHP site refresh is often caused by the browser caching the previous background color. To solve this issue, you can add a random query string to the CSS file link in your HTML header. This will force the browser to reload the CSS file on each refresh, preventing the white flash.

<link rel="stylesheet" type="text/css" href="styles.css?v=<?php echo time(); ?>">