@shopify/polaris/config/postcss-plugins.js

Shopify’s admin product component library

const postcssShopify = require('@shopify/postcss-plugin');
const pxtorem = require('postcss-pxtorem');

module.exports = [
  postcssShopify,
  pxtorem({
    rootValue: 16,
    replace: true,
    propList: ['*'],
  }),
];