User blog comment:Rappy 4187/Technical Update: November 30, 2015/@comment-11733175-20151201201749/@comment-126761-20151201202544

The name is more related to the style of notification rather than meaning to suggest it's used for emergencies. It's not a 'public' name.

As mentioned elsewhere, you shouldn't need to use CSS to hide this - just click "No". If that's not working, that's a bug.