css-expert
- Repo stars 17,717
- Author updated Live
- Author repo openfang
- Domain
- Design
- Compatible agents
-
- Claude Code
- Cursor
- Cline
- Codex
- Windsurf
- Gemini CLI
- +20
- Trust score
- 88 / 100 · community maintained
- Author / version / license
- @RightNow-AI · no license declared
- Token usage
- Lean
- Setup complexity
- Plug-and-play
- External API key
- Not required
- Operating systems
- Unspecified (assume cross-platform)
- Runtime requirements
- No special requirements
- Permissions
-
- Read-only
- Write / modify
- Network behavior
- Local-only
- Install commands
- 26 variants
Profile is derived at build time from SKILL.md and install vectors. Subject to drift from author intent.
Heads up: 未限定 allowed-tools，默认拥有全部工具权限。
---
name: css-expert
description: CSS expert for flexbox, grid, animations, responsive design, and modern layout techniques A fron…
category: design
runtime: no special runtime
---
# css-expert output preview
## PART A: Task fit
- Use case: CSS expert for flexbox, grid, animations, responsive design, and modern layout techniques A front-end layout specialist with deep command of modern CSS, from flexbox and grid to container queries and cascade layers. This skill provides precise, standards-compliant guidance for building responsive, accessible, and maintainable user interfaces using the lat….
- Inputs: target material, constraints, expected output, and acceptance criteria.
- Evidence boundary: follow “Key Principles / Techniques / Common Patterns” and do not present inference as author intent.
## PART B: Execution result
- **01** The card summarizes the use case; runtime output centers on “CSS expert for flexbox, grid, animations, responsive design, and modern layout techniques A front-end layout specialist with deep command of modern CSS, from flexbox and grid to container queries and cascade layers. This skill provides precise, standards-compliant guidance for building responsive, accessible, and maintainable user interfaces using the lat…”.
- **02** When the source has headings, the agent prioritizes “Key Principles / Techniques / Common Patterns” so the result follows the author’s structure.
- **03** Typical output includes task judgment, concrete steps, required commands or file edits, validation, and follow-up options.
- **04** Risk context follows the fingerprint: read files, write/modify files; mostly runs locally; usually needs no extra API key.
## Running Rules
- read files, write/modify files; mostly runs locally; usually needs no extra API key.
- Validate with a small sample before expanding scope.
- Return the result, validation criteria, and next iteration options. Choose the trigger
The source does not require a stable slash command. After installation, invoke the skill by name and describe the task.
Provide inputs and boundaries
Name target files or source material, expected output, forbidden changes, and whether network or shell access is allowed. Permission fingerprint: read files, write/modify files.
Validate with a small run
Start with a small task and check whether the result follows “Key Principles / Techniques / Common Patterns”. Inspect diffs, logs, previews, or tests before expanding scope.
Review before delivery
Confirm the final output includes a concrete result, evidence, and next action. If it stays generic, tighten inputs, boundaries, and acceptance criteria.
---
name: css-expert
description: CSS expert for flexbox, grid, animations, responsive design, and modern layout techniques A fron…
category: design
source: RightNow-AI/openfang
---
# css-expert
## When to use
- CSS expert for flexbox, grid, animations, responsive design, and modern layout techniques A front-end layout specialis…
- Use it when the task has clear inputs, repeatable steps, and validation criteria.
## What to provide
- Target material, scope, expected result, and forbidden changes.
- Whether network, commands, file writes, or external services are allowed.
## Execution rules
- Organize steps around “Key Principles / Techniques / Common Patterns” and keep inference separate from source facts.
- read files, write/modify files; mostly runs locally; usually needs no extra API key.
- Validate with a small sample before expanding the task.
## Output requirements
- Return the deliverable, key evidence, validation method, and next action.
- Mark missing information as unknown; do not invent commands, platforms, or dependencies. Evidence boundary and execution chain
The author source anchors workflow facts; repository files anchor sources and commands; Fluxly only adds fit, limitations, and quality judgment.
skill "css-expert" {
input -> user goal + target files + boundaries + acceptance criteria
context -> Key Principles / Techniques / Common Patterns
rules -> SKILL.md triggers / order / output contract
runtime -> no special runtime | read files, write/modify files | mostly runs locally
guardrails -> usually needs no extra API key + small-sample validation + diff/log review
output -> copyable result + checklist + next iteration
}CSS Expert
A front-end layout specialist with deep command of modern CSS, from flexbox and grid to container queries and cascade layers. This skill provides precise, standards-compliant guidance for building responsive, accessible, and maintainable user interfaces using the latest CSS specifications and best practices.
Key Principles
- Use flexbox for one-dimensional layouts (rows or columns) and CSS Grid for two-dimensional layouts (rows and columns simultaneously)
- Embrace custom properties (CSS variables) for theming, spacing scales, and any value that repeats or needs runtime adjustment
- Design mobile-first with min-width media queries, layering complexity as viewport size increases
- Prefer logical properties (inline-start, block-end) over physical ones (left, bottom) for internationalization-ready layouts
- Leverage the cascade intentionally with @layer declarations to control specificity without resorting to !important
Techniques
- Use flexbox justify-content and align-items for main-axis and cross-axis alignment; flex-wrap with gap for fluid card layouts
- Define CSS Grid layouts with grid-template-areas for named regions, and auto-fit/auto-fill with minmax() for responsive grids without media queries
- Create design tokens as custom properties on :root (--color-primary, --space-md) and override them in scoped selectors or media queries
- Use @container queries to style components based on their parent container size rather than the viewport
- Build animations with @keyframes and animation shorthand; prefer transform and opacity for GPU-accelerated, jank-free motion
- Apply transitions on interactive states (hover, focus-visible) with appropriate duration (150-300ms) and easing functions
- Use the :has() selector for parent-aware styling, :is()/:where() for grouping selectors with controlled specificity
Common Patterns
- Holy Grail Layout: CSS Grid with grid-template-rows (auto 1fr auto) and grid-template-columns (sidebar content sidebar) for header/footer/sidebar page structures
- Fluid Typography: clamp(1rem, 2.5vw, 2rem) for font sizes that scale smoothly between minimum and maximum values without breakpoints
- Aspect Ratio Boxes: Use the aspect-ratio property directly instead of the legacy padding-bottom hack for responsive media containers
- Dark Mode Toggle: Define color tokens as custom properties, swap them inside a prefers-color-scheme media query or a data-theme attribute selector
Pitfalls to Avoid
- Do not use fixed pixel widths for layout containers; prefer percentage, fr units, or min/max constraints for fluid responsiveness
- Do not stack z-index values arbitrarily; establish a z-index scale in custom properties and document each layer's purpose
- Do not rely on vendor prefixes without checking current browser support; tools like autoprefixer handle this systematically
- Do not nest selectors excessively in preprocessors, as the generated CSS becomes highly specific and difficult to maintain or override
Decide Fit First
Design Intent
How To Use It
Boundaries And Review