Tailwind isn't really recognizable at all, since it doesn't ship with any components/style like Bootstrap. It is however such a pleasant way to write code, I'll never go back to regular CSS.
It does come with some default styles (https://tailwindcss.com/docs/preflight), which can be spotted to some degree. There are also some example components, that a lot of people copy, and then transfer some of those styles into other components.