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layoutVercel

Respect Safe Areas

MUST

MUST: Respect safe areas (use env(safe-area-inset-*))

Account for notches and insets with safe-area variables

Bad

Good

Why it matters

Mobile devices with notches and rounded corners have safe areas where content shouldn't be placed. Use CSS environment variables like env(safe-area-inset-top) to ensure your content isn't obscured by device UI elements.

References

Built by Gleb Stroganov, design engineer at Evil Martians.

The rules come from other people's skills and guidelines — Vercel, Rauno Freiberg, @Ibelick, impeccable, Emil Kowalski, Tailwind, RAMS — each one credited on the Sources page. The work here is extraction and wiring: every rule is pulled into one corpus, given a good and a bad example you can operate, a MUST/SHOULD/NEVER rule an agent can paste, and a link back to where it came from.