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good-css SKILL.md skillA

good-css from transitive-bullshit/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add transitive-bullshit/skills/good-css@git:20261011.ef64499

Pins git:20261011.ef64499 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: transitive-bullshit/skills
Path: provenance/upstream/good-css/skill/SKILL.md
Versions recorded: 1
Latest version: git:20261011.ef64499, committed Oct 11, 2026
Size: 4,867 bytes
Repository stars: 4
License: MIT

Modern CSS techniques that replace breakpoint ladders, wrapper elements and scripts. Use whenever you write, edit or review styles in any form, including plain CSS, Tailwind classes, StyleX, CSS-in-JS and inline styles, and whenever you build or restyle a page or component, even if the user never mentions CSS.

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

# Good CSS

One declaration that adapts on its own beats a set of breakpoints, and a CSS feature beats a script. Use JavaScript only where it makes a result nicer that already works without it.

Each technique is a set of properties and values, so it works in any authoring system. Class names in the examples are placeholders. Write the declarations in what the project already uses, whether that is a stylesheet, Tailwind utilities or StyleX objects. Where that system has no shorthand for a declaration, write it the long way, as a Tailwind arbitrary property or a rule in the project's CSS file. Do not swap the technique for a breakpoint.

## In all CSS

These need no file.

- Write `inline` and `block` properties in place of left, right, top and bottom. Tailwind has them too, as in `mbs-`, `pe-` and `inset-bs-`, so never write `mt-`, `pr-` or `top-`. The block ones need Tailwind 4.2. Below it, write them as arbitrary properties, as in `[margin-block-start:theme(spacing.4)]`.
- Write colors in `oklch()`, with `none` as the hue of a gray, white or black. Derive a hover, tint or transparent version with `color-mix(in oklch, …)`.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add transitive-bullshit/skills/good-css@sha256:30b8858e7b407fa0

The line at the top of this page pins the label git:20261011.ef64499, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_657u7off4edty2re.svg)](https://markdownregistry.com/a/art_657u7off4edty2re)

1 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Oct 11, 2026.

version	committed	commit	size	audit
git:20261011.ef64499 latest	2026-10-11	ef64499	4,867 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4867 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

GitHub

transitive-bullshit/skills · 4 stars · license MIT · pushed 2026-10-21 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_657u7off4edty2re
GET https://markdownregistry.com/api/v1/resolve?ref=transitive-bullshit/skills/good-css
GET https://markdownregistry.com/api/v1/blob/30b8858e7b407fa00196d6b242d943b202860f1d9f4dd9348fa79f0b1d950375

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

More from transitive-bullshit/skills

AGENTS.md AGENTS.md file

transitive-bullshit/skills · AGENTS.md

git:20261012.cfd478c · audit A · 4 stars

resolving-merge-conflicts SKILL.md skill

transitive-bullshit/skills · provenance/history/2026-10-11-removed/resolving-merge-conflicts/SKILL.md · Use when you need to resolve an in-progress git merge/rebase conflict.