I spent pretty much all day yesterday working through exactly that,… though I was working from a clean slate (running the book script from the beginning). I’ve got it all working, and I opened a bug in the process: field outlines are hidden - even when focus is applied. · Issue #489 · rails/tailwindcss-rails · GitHub
I imagine it would be harder to start with Tailwind 3.3 and convert in the middle, but future readers will start fresh with Tailwind 4.