postcss.config.js

const purgecss = require("@fullhuman/postcss-purgecss")({
  // Specify the paths to all of the template files in your project
  content: [
    "**/*.vue"
    // etc.
  ],
  css: ["**/*.css"],

  // Include any special characters you're using in this regular expression
  defaultExtractor: content => content.match(/[\w-/:]+(?<!:)/g) || []
});

module.exports = {
  plugins: [
    require("tailwindcss")("./tailwind.js"),
    require("autoprefixer"),
    purgecss
  ]
};