Where I have to put prepared HTML, CSS and JS?

this example makes use of the scrollMagic-library mentioned in your link.
scrollMagic_example.hype.zip (12.1 KB)

just scroll up... it's a very basic example.

please look up https://scrollmagic.io/ for further info and API of scrollMagic.

Note: as my example seems to work in a first short test you may run into trouble cause Hypes runtime tries to hold control for its elements positions. scrollMagic may interfer here ...