insert a warning message into post-new.php

wondered if anyone knew the most elegant way to insert some sort of warning message each time someone tries to create a new post, i.e. ‘please remember what you publish is your own responsibility’, that sort of thing.

I’m thinking I’d like to use the error or warning css wordpress uses if it can’t find something or there’s an error some place. I’d have thought calling it from the functions file would be best so it doesn’t get overwritten each time I update but not really sure what to search to find the reference for it, any ideas?

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