IWS.BY Email Button - module for CMS Joomla 5, with which you can add a floating button on the site with a link to e-mail in a few clicks of the mouse without having to learn programming skills.
All information and the opportunity to get the module is available at the link on the official website of the developer:
https://iws.by/en/shop/joomla-exstension-en/floating-email-button-for-joomla-3-and-joomla-4/
An example of the module's operation is displayed on the lower right side of the screen as a floating and pulsating button.