Executing a PHP HTML-CSS container on top of various content management systems

I have created two PHP modules, one is a contact form module and one is a a sticky "call now" module.

I can access the contact form by example.com/contact_form.php but in contrast, example.com/call_now.php shouldn't be a standalone webpage, rather just a container for some HTML and CSS which I want to execute on top of every webpage in my website.
(I use .php instead .html because it allows includes which I use a lot).

How could I execute the PHP-formatted, HTML-CSS container on top of any content management system (CMS-agnostically) so that if tomorrow I will change the CMS from MediaWiki to Drupal, any user could still use the same sticky "call now" button?

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Executing a PHP HTML-CSS container on top of various content management systems

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