playlet/qwh5/postcss.conf...

module.exports = {
  plugins: {
    autoprefixer: {},
    'postcss-px-to-viewport': {
      viewportWidth: 375,
      unitPrecision: 5,
      viewportUnit: 'vw',
      selectorBlackList: ['.ignore', '.hairlines'],
      minPixelValue: 1,
      mediaQuery: false,
      exclude: /node_modules/
    }
  }
}