Simple app deployed on Heroku for this Stackoverflow question: https://stackoverflow.com/questions/46873665

index.html

<h1>Works</h1>

package.json

{
  "name": "Enigma",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "start": "node server.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

Procfile

web: node .

server.js

'use strict';

const http = require('http');
const fs = require('fs');

const server = http.createServer(function (request, response) {

    console.log(request.method, request.url);
    if (request.url == '/style.css'){
        const css = fs.readFileSync('style.css', 'utf8');
        response.end(css);
    }else{
        const html = fs.readFileSync('index.html', 'utf8');
        response.end(html);
    }
});
console.log('port = ', process.env.PORT);

server.listen(process.env.PORT || 3000);
console.log('Server Started, yay!');

style.css

body {}