ShowerLoop-cc/docker/showerloop/public/purgecss.material.config.js

module.exports = {
  content: ['public/**/*.html'],
  css: ['public/css/vendor/material.indigo-pink.min.css'],
  output: 'public/css/optimized',
  safelist: {
    standard: [/^mdl-/, /is-/, /--/],
    deep: [/^mdl-/]
  }
}