Tailwind CSS V1.2.0 - PurgeCSS config file

README.txt

Install all packages: 
npm init -y
npm i postcss-cli postcss cssnano @fullhuman/postcss-purgecss tailwindcss --save-dev
npm i watch --save-dev // ( optionnal )

package.json : 
Change the path to your styles.css and main.css (    "build:css": "postcss YOUR_PATH/styles.css -o YOUR_PATH/main.css", )

postcss.config.js : 
Change the path to your *.html files and *.js files (if needed) in line 13

Follow the Steps 2 - 3 & 4 : https://tailwindcss.com/docs/installation/

When you are ready, build it :
npm run build:css

package.json

{
  "name": "YOUR_OWN_NAME",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "build:css": "postcss styles.css -o main.css",
    "watch": "watch \"npm run build:css\" ./"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@fullhuman/postcss-purgecss": "^2.0.6",
    "cssnano": "^4.1.10",
    "postcss": "^7.0.26",
    "postcss-cli": "^7.1.0",
    "tailwindcss": "^1.2.0"
  },
  "dependencies": {
    "watch": "^1.0.2"
  }
}

postcss.config.js

const tailwindcss = require('tailwindcss');
const purgecss = require('@fullhuman/postcss-purgecss');
const cssnano = require('cssnano');
const autoprefixer = require('autoprefixer');

module.exports = {
  plugins: [
    tailwindcss('./tailwind.config.js'),
    cssnano({
      preset: 'default'
    }),
    purgecss({
      content: ['./*.html', './assets/js/*.js'],
      defaultExtractor: (content) => content.match(/[\w-/:]+(?<!:)/g) || []
    }),
    autoprefixer
  ]
};

styles.css

/* purgecss start ignore */
@tailwind base;
@tailwind components;
/* purgecss end ignore */

@tailwind utilities;