Add styled-components class naming with CRA

config-overrides.js

const { injectBabelPlugin } = require('react-app-rewired');

module.exports = (config, env) => {
  
  config = injectBabelPlugin(
    [
      'babel-plugin-styled-components',
      {
        displayName: true,
      },
    ],
    config
  );

  return config;
};