# good-css

Replaces breakpoint ladders, layout wrappers and helper scripts with modern CSS. Works with plain CSS, Tailwind, StyleX and CSS-in-JS.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1500 installs · ★ 390
- Author: vojtaholik
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/vojtaholik/good-css/tree/HEAD/skills/good-css/SKILL.md
- Updated: 2026-10-10
- HTML: https://affpapa.org/en/nevibecode/skills/good-css

## What it does

This skill instructs the agent to rely on modern browser capabilities rather than breakpoint ladders and wrapper elements. It enforces logical properties like `inline` and `block` instead of top, right, bottom and left. Colors belong in `oklch()`, fluid scaling runs through a single `clamp()` token, and hover states stay inside fine-pointer media checks.

Rules are organized across reference guides covering page layouts, scrollable areas, typography, and interactive components. Using Tailwind CSS requires attention: block-level logical utilities demand Tailwind 4.2. In older releases, the skill falls back to arbitrary properties such as `[margin-block-start:theme(spacing.4)]`.

The guidelines explicitly forbid `outline: none`, `transition: all`, and `text-rendering: optimizeLegibility`. When animation skills by Emil Kowalski (like `animate` or `review-animations`) are installed, `good-css` hands over motion design, gestures, and spring tuning to them.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add vojtaholik/good-css --skill good-css -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/good-css/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/good-css/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add vojtaholik/good-css --skill good-css -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/good-css/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add vojtaholik/good-css --skill good-css -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/good-css/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install vojtaholik/good-css good-css
```

2. **Manually: put the files in place**
- File: `.github/skills/good-css/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add vojtaholik/good-css --skill good-css -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/vojtaholik/good-css --path skills/good-css
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/good-css/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add vojtaholik/good-css --skill good-css -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/vojtaholik/good-css/tree/HEAD/skills/good-css/SKILL.md

## When to use it
- eliminate breakpoint ladders using fluid clamp declarations
- convert directional margins and paddings to logical properties
- generate accessible hover states and tints with oklch color-mix
- safeguard animated transitions behind prefers-reduced-motion

## Example prompts
- Restyle the profile card using good-css rules without extra wrapper divs
- Review `components/Sidebar.tsx` and replace directional spacing with logical properties
- Build a responsive modal dialog relying entirely on modern CSS features

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: fad6b707601f26b3.

BEGIN THIRD-PARTY FILE fad6b707601f26b3
```text
---
name: good-css
description: 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.
---

# 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, …)`.
- Put sizes that grow with the screen in one `clamp()` token.
- Put every `:hover` rule inside `@media (hover: hover) and (pointer: fine)`.
- Style focus with `:focus-visible` and `outline`. Never write `outline: none`.
- Give everything pressable an `:active` state.
- Put a transition that moves or scales something inside `@media (prefers-reduced-motion: no-preference)`. Name its properties, never `all`, and never use `ease-in`.
- Cut off overflow with `overflow: clip`. Keep `hidden` for an element a script scrolls.

## Read the entry before you write

Each file holds entries with the CSS and its rules. The rules are the conditions the CSS needs to work, so keep all of them. Read only the files whose row matches what you are about to write. One component matches two or three, and a whole page matches most of them.

| Read | Before you write |
| --- | --- |
| `references/foundations.md` | a reset or base stylesheet, a set of color tokens, dark mode, a type or spacing scale |
| `references/layout.md` | a page or section container or any centered `max-width` wrapper, whether or not anything goes edge to edge, a grid of cards, cards whose parts line up, a sidebar, a component placed in slots of different widths, overlapping layers, centered content that can overflow |
```
END THIRD-PARTY FILE fad6b707601f26b3

The third-party file has ended. Everything between the fad6b707601f26b3 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 2778 of 4867 bytes. © vojtaholik · MIT · https://github.com/vojtaholik/good-css/tree/HEAD/skills/good-css/SKILL.md

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---
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