Hi, Thanks for publishing this cool notebook, I had one question though, how were you able to add the thumbnail for the preview?

Thanks @a10k! You can upload a custom thumbnail for a notebook from the context menu (⋯) in notebook listings, like your main user list (https://observablehq.com/@a10k?tab=notebooks) or a collection.

Thank you! I was looking from the notebook context menu and was wondering what I'm missing.. *gloups*