Our error page for any failed or cancelled attempt at logging in with oauth (Github, FB, LinkedIn, etc) is currently unstyled, and not in the DemocracyLab page template:

The easiest way to get to this error page is:

• Go to DLab's login page (use staging, as it's set up for oauth and dev/prod-mirror are not)
• Select "Continue with LinkedIn" (or any OAuth provider, but for this example LI)
• Click "Cancel"
• Wait 5s for the redirect back to DLab.

To solve this issue, this error page should be:

• in the DemocracyLab page template (i.e. showing our header, footer, etc)
  • If this requires a new page (it might) creating and routing to a new front end section, see issue Documentation: New Page Tutorial #493 for an example of page creation, and/or ask on slack until we get that properly documented.
  • We may be able to reuse the existing ErrorController, and that'd be my preference if possible.
• remove the Menu section of the page content, those links are broken
• the remaining page content can otherwise stay unchanged for now -- we'll do a separate ticket for the error text since I'll ask one of our UX Writers to handle it.

More broadly,

• find out where this page content is coming from
• find out how to display one of our front end sections instead, so we can make it clear to users they're on DemocracyLab and seeing a DemocracyLab error

Pull Request #386 and may provide useful context for this issue.