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designVercel

Interactions Increase Contrast

MUST

MUST: Increase contrast on `:hover/:active/:focus`

Hover, active, focus states have more contrast than rest state

Bad

Good

Why it matters

Interactive states should draw attention. Increase contrast on hover, active, and focus states by darkening text, strengthening backgrounds, or adding shadows. This provides clear feedback that the element is interactive.

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.