old_contents: // in server.js
  const express = require('express');
  const app = express();
  
  // Since the root/src dir contains our index.html
  app.use(express.static(__dirname + '/public/'));
  
  // Heroku bydefault set an ENV variable called PORT=443
  //  so that you can access your site with https default port.
  // Falback port will be 8080; basically for pre-production test in localhost
  // You will use $ npm run prod for this
  app.listen(process.env.PORT || 8080);
new_contents: // in server.js
  const express = require("express");
  const app = express();
  
  // Since the root/src dir contains our index.html
  app.use(express.static(__dirname + "/public/"));
  
  // Heroku bydefault set an ENV variable called PORT=443
  //  so that you can access your site with https default port.
  // Falback port will be 8080; basically for pre-production test in localhost
  // You will use $ npm run prod for this
  app.listen(process.env.PORT || 8080);
subject: Fix quotes in server.js