AI product Open source
good-css is a collection of opinionated modern CSS techniques packaged as an agent skill for coding agents. It guides agents toward CSS declarations that adapt without breakpoint-heavy layouts and toward CSS features instead of JavaScript; the techniques work in plain CSS, Tailwind, StyleX, or other CSS systems. The accompanying PRACTICES.md documents when to use each technique, shows its CSS, explains why it works, and credits its source, while good-css.com provides a live specimen for every entry. The skill can be installed for agents that support the Agent Skills format, including Claude Code, Codex, and Cursor, or added manually; the repository is MIT-licensed.
1 use taken from transcripts — each links to the moment in the video.
A set of modern CSS habits packaged for coding agents with a live example for each, nudging toward fluid sizing with clamp, color tokens for light/dark modes, and adaptive layouts without piles of breakpoints or JavaScript.
1 in the library.