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layoutVercel

No Excessive Scrollbars

MUST

MUST: Avoid unwanted scrollbars; fix overflows

Only render useful scrollbars; fix overflow issues

Bad

Good

Why it matters

Unexpected scrollbars indicate layout problems. Fix the root cause (usually overflow issues) rather than hiding scrollbars with CSS. On macOS, set "Show scroll bars" to "Always" during development to catch these issues.

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.