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designVercel

Crisp Borders

SHOULD

SHOULD: Crisp edges via semi-transparent borders + shadows

Combine borders and shadows for clear edges

Bad

Good

Why it matters

Shadows alone can look muddy. A subtle border (often semi-transparent) makes edges crisp and clear. Use rgba() with low opacity for borders so they adapt to different backgrounds.

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.