text: const express = require('express');
  
  const app = express();
  const port = process.env.PORT || 4000;
  
  app.use(express.static(__dirname));
  
  app.listen(port, function(err) {
    if (err) throw err;
    console.log('server running at http://127.0.0.1:' + port);
  });
  