Too bad because once I saw it and tried it out, that's when I thought the experience feels slick and polished.
I think you shoud consider either having an onboarding that highlights it or put a giant arrow on your landing page background, between the video and the bar, with a "Try it on this page"
When I debug CSS or toy with styling, I will often edit the element styles directly but naturally I would like them to be applied within classes the element has, or maybe add a new utility. Never would I put styles on the element.
I suppose that in the same fashion, if your project uses tailwind or something, you will edit styles manually but when you get it right you want them to be added as “whatever the code uses”