CSS

What this skill does

Writes and debugs CSS: flexbox and grid layout, z-index and stacking, responsive breakpoints, theming, and render performance. Use when a layout breaks or overflows, z-index does nothing, the page scrolls sideways, `position: sticky` won't stick, text won't truncate, styles lose the cascade or need `!important`, content jumps while loading (CLS), transitions stutter, fonts flash, a modal or dropdown sits behind other content, form controls need restyling, a table needs sticky headers, printing comes out wrong, or a style works in Chrome but not Safari. Also for starting a stylesheet from scratch (reset and base layer), centering, container queries, fluid type with clamp(), design tokens and dark mode, RTL and logical properties, and modernizing old stylesheets with `:has()`, `@layer`, and nesting. Not for visual design taste — palettes, spacing scales, typeface choice.

CSS is part of the Developer Tools category — developer tools that help your agent write, review, debug, and ship code. You can install it on its own or alongside other developer tools skills from the OpenClaw catalog.

How to install CSS

The easiest path is via the OpenClaw Easy desktop app — one click, no terminal required:

1. Download OpenClaw Easy for macOS or Windows (free, one-click installer, ~30 seconds).
2. Open the in-app Skills panel.
3. Search for css and click Install.
4. The skill activates automatically when an incoming message matches its description.

Install from the command line

If you already run the OpenClaw CLI, add CSS with a single command:

openclaw skills add css

This pulls css from ClawHub and installs it into ~/.openclaw/skills/css/. Restart the OpenClaw gateway afterwards so the new skill is discovered.

How to use CSS

Once installed, CSS activates on its own: when an incoming message on WhatsApp, Telegram, Slack, Discord, Feishu or Line matches the skill's description, your OpenClaw agent loads it and runs the workflow. You can also trigger it explicitly by describing the task in chat. No extra configuration is required after install.

Manual install (advanced)

If you prefer manual installation:

1. Click the Download .zip button above to grab css-1.0.4.zip directly from our S3 mirror.
2. Unzip into ~/.openclaw/skills/css/ (create the directory if it does not exist).
3. Restart OpenClaw Easy (or the OpenClaw CLI gateway) so the new skill is discovered.

Frequently asked questions

How do I install CSS?

Install CSS in the OpenClaw Easy desktop app by opening the Skills panel, searching for css, and clicking Install. From a terminal you can run: openclaw skills add css. Either way the skill is placed in ~/.openclaw/skills/css/.

Is CSS free?

Yes. CSS is free and open-source, distributed under the Apache-2.0 license through ClawHub. No account or payment is required to download or run it.

What does CSS do?

Writes and debugs CSS: flexbox and grid layout, z-index and stacking, responsive breakpoints, theming, and render performance.

Related: more developer tools skills

If CSS looks useful, you may also want to check out other developer tools skills in the OpenClaw catalog:

• Cross-Pollination Engine ⬇ 3.1K
• HTML ⬇ 3.1K
• GitLab ⬇ 3.1K
• Context7 API Documentation Fetcher ⬇ 3.1K
• Generate Presentation ⬇ 3.1K

Browse the full OpenClaw skill catalog

This page covers just one skill. The OpenClaw skill hub has 10,000+ more — search, sort by downloads or stars, and install any of them in one click. There is also a curated awesome-openclaw-skills list grouped by use case.