Link to Flat-UI node_modules

I use Express 4.12.3 + JADE + flat-ui npm module (http://ift.tt/1EquvA3)

How is it possible use this module in jade?

When i run page, i get many 404 codes. I fix it with:

app.get('/e-css/flat/bootstrap.css',function(req,res) {
  res.sendFile(path.join(__dirname,'node_modules','flat-ui','bootstrap','css','bootstrap.css'));
});

In Jade:

link(rel='stylesheet', href='/e-css/flat/bootstrap.css')

I have in code many links like this.

Can be there more elegant solution?

Thank you.