What is Frontend CSS?

A set of guidelines for writing and organizing CSS, the language that controls a website’s visual appearance. It covers consistent methods, reusable design values, and keeping styles manageable.

Use it when building or changing website layouts, colors, spacing, typography, or components. It helps keep CSS aligned with the project’s existing framework and conventions.

It helps prevent conflicting styles and inconsistent layouts as a project grows. It also reduces unnecessary custom CSS and unused production styles.

How johnreitano/spekka configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to johnreitano/spekka. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/johnreitano/spekka/main/.claude/skills/spekka-frontend-css/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/johnreitano/spekka

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-frontend-css/github.svg)](https://agentmods.dev/skills/johnreitano/spekka/spekka-frontend-css)

Your own site

<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-frontend-css"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-frontend-css/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-frontend-css"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-frontend-css.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 182 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00024	$0.00182
Opus 5.5	$0.00010	$0.00073
Sonnet 5.5	$0.00005	$0.00036
Haiku 4.5	$0.00002	$0.00018

Measured 2mo ago against content hash 37a18fa1117f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Frontend CSS scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/spekka-frontend-css/SKILL.md · 17 lines

What it actually says

Frontend CSS

This Skill provides Claude Code with specific guidance on how it should handle frontend CSS.

Instructions

Consistent Methodology: Apply and stick to the project's consistent CSS methodology (Tailwind, BEM, utility classes, CSS modules, etc.) across the entire project
Avoid Overriding Framework Styles: Work with your framework's patterns rather than fighting against them with excessive overrides
Maintain Design System: Establish and document design tokens (colors, spacing, typography) for consistency
Minimize Custom CSS: Leverage framework utilities and components to reduce custom CSS maintenance burden
Performance Considerations: Optimize for production with CSS purging/tree-shaking to remove unused styles

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 17 lines · 24 tokens per session scan A 37a18fa1117f

Subscribe to this mod's changes

Frontend CSS is a skill published in the GitHub repository johnreitano/spekka (5 stars, last pushed 9mo ago), licensed MIT. It adds 24 tokens to every session and 182 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

CSS and styling Frontend

Frontend CSS next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
Frontend CSSjohnreitano/spekka	Skill	5	9mo ago	MIT	A	24	Claude Code
anti-slop-designsickn33/agentic-awesome-skills	Skill	49k	yesterday	MIT	A	34	Claude Code
chakra-ui-builderchakra-ui/chakra-ui	Skill	41k	yesterday	MIT	A	214	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	3d ago	MIT	A	52	Codex
open-design-setupcompozy/compozy	Skill	2.8k	yesterday	MIT	A	67	Claude Code, Codex
edit-sitemicrosoft/power-platform-skills	Skill	1.1k	yesterday	MIT	A	104	Claude Code
frontend-visual-qadaymade/claude-code-skills	Skill	1.5k	yesterday	MIT	A	125	Claude Code, Codex

spekka: Skill for Claude Code