Add support PostCSS plugins

Created by: pavinthan

How to use additional PostCSS plugins like tailwindcss?

plugins: () => [
    require('postcss-flexbugs-fixes'),
    require('postcss-preset-env')({
        autoprefixer: {
            flexbox: 'no-2009',
        },
        stage: 3,
    }),
 ],

Can we extends this to use some other plugins?