I want to add that the tutorial page is useless IMO. You should definitely consider adding syntax highlighting and using a different font. It's totally unclear.
Sadly, after multiple clicks I still have no idea if the language could interest me, and I'm not going to look further. :/
Looks much better to me. I would also change the font family to a monospaced font, such as Fira Mono[1]. That would be two small modifications that lead to better readability IMO. If you want it even fancier, I found this page[2] that can highlight and format Io code...
Sadly, after multiple clicks I still have no idea if the language could interest me, and I'm not going to look further. :/