The error I was having in my cli when trying to compile my css with tailwind was:
'tailwindcss' is not recognized as an internal or external command
The cause was that my tailwind was upgraded.
Install postcss and postcss-cli
npm install postcss postcss-cli
And from here you can run your build script like this:
npx tailwindcss-cli@latest build ../css/main.css -o ../dist/tailwind.css