site/postcss.config.js

const cssnano = require('cssnano')({
  preset: 'default'
})

module.exports = {
  from: 'src/css/index.css',
  to: 'dist/css/index.css',
  plugins: [
    require('postcss-import'),
    require('tailwindcss'),
    require('autoprefixer'),
    ...(process.env.NODE_ENV === 'production' ? [cssnano] : [])
  ]
}