personal-website/assets/errors/404.php

<?php
$COMMONS = "./../../docs/common";

include_once($COMMONS."/header.php");

display_header("404: Not Found");
?>

<article>
<h2>404: Not Found</h2>
<div class="centered-container">
<img src="https://assets.zdenekborovec.cz/upload/7316caee796b4cb280cc769ea5f852fa/32a6269147ce4c6c813d4f0449ae1da9/9f532c593d134c6dad5bc63684fe22c2" alt="GIF of a cat hiding in a cupboard">
</div>
</article>

<?php
include_once($COMMONS."/footer.php");
?>