The login screen used to authenticate with the passportjs es6 app that was discussed in previous posts is just a simple react, redux template based login screen.
The template was a derivation from real-world redux example. So there may be some template code here and there.
The UI looks something like:
The code for the same can be got from here: https://github.com/Vivek-V-N/simple-tests/tree/mui-react-login/mui-react-login