Some Tailwind styles not working in production with Next.js

Issue

For some reason a few styles don't seem to be working in production build hosted on Netlify. This seems to only be happening on a single component. It's a wrapper located at ./layout/FormLayout.tsx (don't know if that changes anything). Here is the wrapper:

const FormLayout: React.FC<FormLayout> = ({ children, title, description }) => {
    return (
        <div className="w-screen mt-32 flex flex-col items-center justify-center">
            <div className="p-6 flex flex-col items-center justify-center">
                <h2 className="text-4xl font-semibold text-blue-400">
                    {title}
                </h2>
                {description && (
                    <h6 className="mt-4 text-md font-medium">{description}</h6>
                )}
                <div className="mt-12 w-max">{children}</div>
            </div>
        </div>
    )
}

and it's used here:

const Register: React.FC<RegisterProps> = () => {
    return (
        <FormLayout title="Register" description="Register with your email.">
            {/* form stuff. styles do work in here */}
        </FormLayout>
    )
}

Here are some of the config files:

tailwind config:

module.exports = {
    purge: ['./pages/**/*.{js,ts,jsx,tsx}', './components/**/*.{js,ts,jsx,tsx}'],
    darkMode: 'class',
    theme: {
        extend: {},
    },
    variants: {
        extend: {},
    },
    plugins: [],
}

postcss config:

module.exports = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
}

Here is a graphical example of what is happening:

For my build command, I use next build && next export, and Netlify deploys the /out directory.

All the code is here via github

Solution

For anyone seeing this in the future, just add the path to any new folder in the purge array into the tailwind config like this:

module.exports = {
    purge: [
        './pages/**/*.{js,ts,jsx,tsx}',
        './components/**/*.{js,ts,jsx,tsx}',
        './layout/**/*.{js,ts,jsx,tsx}',
        './helpers/**/*.{js,ts,jsx,tsx}',
        // Add more here
    ],
    darkMode: 'class',
    theme: {
        extend: {},
    },
    variants: {
        extend: {},
    },
    plugins: [],
}

Answered By - Herbie Vine