What in node is responsible for loading css and script?

Question

Node.js

What is responsible for loading styles and scripts in Node?
Do I need to write another response with a command after fs (file)?

var http = require("http");
var fs = require("fs");

http.createServer(function(request, response) {
  fs.readFile("index.html", {encoding: "utf-8"}, function(error, file) {
      response.writeHead(200, {"Content-type" : "text/html"});
      response.write(file);
      response.end();
  });
}).listen(8000);
console.log('Server running on port 8000');