Summary
This is your reference when you need container queries, `calc-size()` for animating to auto heights, or OKLCH colors instead of HSL. It covers the modern stuff that actually shipped: view transitions, scroll-driven animations, anchor positioning, `text-wrap: balance`, and the new dynamic viewport units. Also handles newer HTML like customizable selects and popover attributes. Reach for this when refactoring old flexbox hacks or when you're starting fresh and don't want to write CSS like it's 2015. The cascade layers section alone will save you from specificity hell on larger projects.
Install to Claude Code
npx -y skills add paulirish/dotfiles --skill modern-css --agent claude-codeInstalls into .claude/skills of the current project.
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →
Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →
Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Files
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Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →
