server.js

const express = require("express");
const path = require("path");

const app = express()
const PORT = process.env.PORT || 3000

app.use(express.static(path.join(__dirname, "build")))

app.get("*", function (req, res) {
  res.sendFile(path.join(__dirname, "build", "index.html"))
})

app.listen(PORT)