I'll be honest I didn't notice it sitting up there in the top right until I saw this message, it's in that area I ignore where people usually put social logos etc.
Anyway - question on the software itself, how would CSS changes feed through to the code? Inline CSS, utility classes if you're using a framework? Does it support using something like Vite for compiling?
All the technical decisions are yours. If you defined a padding (for instance) in a stylesheet, this is where updates will be applied. Likewise if it was on a style attr or elsewhere.
I agree, I almost missed it and left the website.
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"