Using tailwind purge option to remove unused css, but all styles are getting removed

Question

Using tailwind purge option to remove unused css, but all styles are getting removed.

Reference: https://v2.tailwindcss.com/docs/optimizing-for-production#basic-usage

My tailwind.config.js file looks like below

module.exports = {
  purge: ['./src/page/**/*.js', './src/layouts/**/*.js', './components/**/*.js'],
  darkMode: false,
  theme: {}
}