This feels like a self contained surgical improvement. Thank you! I will take a look when possible and coordinate with my colleagues with respect to merging or requesting changes.

Also, this pull request seems to incorporate changes from your previous PR. In such a cases, I recommend mentioning that the two are basically stacked onto each other.

Thanks @bassosimone! You're right - the previous version had a second commit that modified

Home.py and ui_components.py, which overlapped with other work.
I've force-pushed to clean this up. The PR now contains a single commit with only the new
Country_Compare.py file - fully self-contained, no overlap with any other PR.

The deprecation fix for Home.py and ui_components.py
(use_container_width → width="stretch") will be submitted as a separate PR. This PR is independent and can be merged on its own.

After listing our project for GSoC, we received a large amount of pull requests across several repositories. We are dealing with the backlog, but this would take time. We will get back to this pull request eventually. In the meanwhile, if you are a GSoC applicant, please read our updated GSoC policy: https://github.com/m-lab/gsoc/.