styles-rem-not-px Cursor ruleA
styles-rem-not-px from truefoundry/trueforge is a Cursor rule: instructions the Cursor agent follows in that repo.
mdr add truefoundry/trueforge/.cursor/rules/styles-rem-not-px.mdc@git:20260907.bc11131Pins git:20260907.bc11131 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 14 of 14 checks passed
- Kind
- Cursor rule
- Repository
- truefoundry/trueforge
- Path
.cursor/rules/styles-rem-not-px.mdc- Versions recorded
- 1
- Latest version
- git:20260907.bc11131, committed Sep 7, 2026
- Size
- 1,055 bytes
- Repository stars
- 6,446
- License
- MIT
Prefer rem over px for UI lengths (1rem = 16px).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Styles use rem, not px Do not introduce CSS/Tailwind lengths in `px`. Use `rem` with **1rem = 16px**. ## Convert | px | rem | |----|-----| | 8px | 0.5rem | | 10px | 0.625rem | | 11px | 0.6875rem | | 12px | 0.75rem | | 14px | 0.875rem | | 16px | 1rem | | 24px | 1.5rem | | 32px | 2rem | | 48px | 3rem | ```tsx // ❌ BAD className="text-[10px]" const margin = '48px'; // ✅ GOOD className="text-[0.625rem]" const margin = '3rem'; ``` Prefer Tailwind spacing scale utilities (`p-2`, `gap-1.5`, `text-sm`) when they match; they already resolve to rem. ## Allowed exceptions - `0px` in `calc()` / `env()` fallbacks (e.g. `env(safe-area-inset-bottom, 0px)`) - Media-query device breakpoints that already exist as px (e.g. `(max-width: 767px)`) — do not invent new px style lengths elsewhere to match them - Canvas / measurement APIs that require CSS pixels for drawing math
Read the whole file at its exact version.
How to install
mdr add truefoundry/trueforge/.cursor/rules/styles-rem-not-px.mdc@sha256:d3093954f434fb3cThe line at the top of this page pins the label git:20260907.bc11131, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_dkasvsbe4r6nt4xh)
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Versions
The registry has recorded 1 version of this file, committed on Sep 7, 2026.
Audit of the latest version
- pass: Size between 200 bytes and 200 KB (1055 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
truefoundry/trueforge · 6,446 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dkasvsbe4r6nt4xh GET https://markdownregistry.com/api/v1/resolve?ref=truefoundry/trueforge/.cursor/rules/styles-rem-not-px.mdc GET https://markdownregistry.com/api/v1/blob/d3093954f434fb3cb0e38cc1ec57a25aaf5f0f79f62071c688854c3b310afa73
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Guides: Cursor rules vs AGENTS.md · which agent file does what.