Sigma.js: How to create fullscreen & zoom control buttons in a Sigma.js webapp using vanilla JS?

Question

I am working on a Sigma.js webapp and need to implement primarily a full screen (and zoom-in and out buttons as well). While it is very easy to implement with React-Sigma controls, I cannot use the library for some reasons and need to use vanilla JS with just Sigma.js

How can I add these buttons?