Agree or Die Button
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This example, recreated from Atomic's website, merges the typical "disagree" and "abort" buttons into a slick button that only takes up 1 button unit of pixel space.
A simple hover action over the :pseudo element powered X marks the spot, doubles the thickness creating a clean look to match the clean, trustworthy font (Montserrat).
A 1px transform brings it altogether upon click, which would be handled through async JS in a real in-app implementation.