Fix toolbar placement and app theming

[jonalmeida]

Closes #3691

Pull Request checklist

• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

[mergify]

This pull request has been removed from the queue for the following reason: pull request dequeued.

Pull request #3699 has been dequeued. Mergify failed to merge the pull request. GitHub can't merge the pull request after 15 retries.
Waiting for the branch protection required status checks to be validated.

You can check the last failing draft PR here: #3706.

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.
If you do update this pull request, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.