onec.me/themes/beautifulhugo/exampleSite/layouts/partials/footer_custom.html

<!--
If you want to include any custom html just before </body>, put it in this file.
Or you can delete these file if you don't need it.
-->
<!-- for example, you could include some js libraries:
<script src="https://cdnjs.cloudflare.com/ajax/libs/vis/4.19.1/vis.js" integrity="sha256-HdIuWBZj4eftihsoDCJoMYjZi6aNVaw7YlUpzKT3ZxI=" crossorigin="anonymous"></script>
-->