Your browser console might help you to debug ?
But i don’t think the css is the script you’re looking for, you need more than just rendering
When looking at the file structure of a component
you’ll have to embed your scripts (.js) in a (header).html file
I’d try to look at the code and structure of… lets say DiscoTOC and
i concur with
enthusiast (I, a long time ago, spent a little time with Karpov 
)
willing to learn
spending the time to implement 