how to setup postcss for tailwind code example

Example 1: error: postcss plugin tailwindcss requires postcss 8.

yarn remove tailwindcss postcss autoprefixer
yarn add tailwindcss@npm:@tailwindcss/postcss7-compat @tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9

Example 2: tailwind css

<link href="https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css" rel="stylesheet">