Currently Kagi has the option to add a no_css parameter to one's search query to disable custom CSS. This is all well and good assuming a user knows how to add a custom parameter, and remembers the parameter to add. Consider grandma, or a less technically inclined user, is unlikely to know or remember this. If they still want to trick out their Kagi experience with some custom CSS (maybe from GitHub or elsewhere) and something goes wrong, they'd have to remember either the no_css parameter or the URL to Kagi's settings. While this may be unlikely to happen it still might be a good idea to have a sort of "emergency search" available in this case.
Searching for terms such as "disable custom css" "how to turn off custom kagi css", or similar search terms that indicate a user is having trouble with their custom styling should display the search result page rendered without custom CSS, as if the no_css parameter was used. This should only apply to the single results page for this search, to avoid unwanted toggling of a user's global custom CSS setting. This option should be able to be disabled if desired.