<div style="border:1px dotted #000; text-align:center; padding:10px;">

<a href="<?php bloginfo( 'tempate_url' ); ?>/custom/advertising.php">Modify the file as required in /custom/advertising.php</a></p>

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({
          google_ad_client: "ca-pub-4131718172502305",
          enable_page_level_ads: true
     });
</script>
</div>