On occasion, CiviCRM produces an error page like this (for example, when someone tries to visit a contribution page that has since been disabled):
How can I make sure that this shows up in the site's theme instead of a blank white, unfriendly, actually-rather-scary page?
BONUS FOLLOWUP: would it be possible to set up a redirect setting for specific disabled pages, to forward them to a live page, or a more descriptive message?