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Description
When sharing a prototype externally (e.g. on Heroku), a mistyped or dodgy URL currently shows a very bare "Not found" message. This can make it look like the whole prototype is broken, rather than just the specific page.
For example, when a URL is pasted into PowerPoint, it can automatically add characters or whitespace, resulting in a dodgy link (e.g. a space becomes %20). The current 404 experience doesn’t make it clear that the prototype itself is working fine and that it's just that the page doesn’t exist.

It would be helpful if the 404 page:
- Looked more polished
- Reassured users that the prototype is still running
- Suggested checking the URL or returning to the start
This is especially useful when prototypes are shared with non-technical stakeholders.
However, i think it's ideal the 404 looks ugly in development mode. As that's a good sign that something broke. But when it comes to being in production mode (ie on heroku etc.) then it's better to be more gentle.
Thanks!
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