We can see in HTML comments of the web page:

<!-- In case I forget: Backup password is at ./backup.txt -->

However we get a 403 Forbidden if we try to access this file with /backup.txt

We can see that the CSS file is included with href="/static?f=index.css"

So if we go to /static?f=backup.txt, we get the credentials for the develop user.

Flag: ractf{developerBackupCode4321}

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