How to run jupyter notebook on app running on localhost

Working on this for a while: I am trying to embed a Jupyter notebook (in an iframe) in a rails app that is running on localhost:3000. The idea is to have multiple people work and be able to view and interact with the notebook, only in the local environment. I set up a password, but not authentication, but the notebook is not showing on the rails app despite the various different configurations in the jupyter_notebook_config.py I've tried.

Any guidance would be appreciated.