text: const express = require('express')
  const app = express()
  
  // app.get('/hello', (req, res) => res.send('Hello World!'))
  
  app.use('/css', express.static('css'))
  app.use('/src', express.static('src'))
  app.use('/external', express.static('external'))
  app.use('/demo', express.static('demo'))
  app.use('/', express.static('demo'))
  
  app.listen(80, () => console.log('Example app listening on port 80!'))