I’m making the first project for the FreeCodeCamp Front End Development Libraries, and I’ve almost finished it locally, but when I copy and paste it to Codepen (importing React, ReactDOM, Bootstrap and React-bootstrap), it doesn’t render. I’ve been looking for a solution for a while and I’ve not been able to find why it isn’t rendering there.
The problem seems to be with React Bootstrap. I remember it being weird on Codepen but I’m not sure I remember what the solution was (using the normal script loading and then the global object it exposes I believe). I would suggest you use CodeSandbox instead, it’s much better for React anyway.
Here is a sandbox with your code and the dependencies you can fork.