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I’ve seen “The Infinite Napkin” passed around in math circles. I can’t vouch for it and I haven’t read much of it:

https://web.evanchen.cc/napkin.html

Er, +1000

Man, if I had forty hours instead of forty minutes, I bet I could actually have explained this all.

This book is my attempt at those forty hours.

This project has evolved to more than just forty hours.

https://tutorial.math.lamar.edu/ are pretty good, although they're mostly focused on the applied part.

Paul's notes are great! Carried my butt through Calc 3 and PDEs, especially when the math for these classes get a little more formulaic (that is there is a pretty small set of reasonable questions you could possibly ask). His stuff is significantly more well done than any text book I had assigned for college math.

MIT OCW has lectures for most undergrad CS/Engineering Math.