A CSS UI library exploring how next-gen HTML & CSS features can change the way we create components. Designed to be used by professional teams as well as tinkering hobbyists.

https://open-props-ui.netlify.app/html/guide/getting-started/

The project is managed as a monorepo with two main parts:

• The Library (packages/opui): Contains the framework-agnostic core of the library. It is managed as a standalone workspace package named opui.
  • components/: UI components organized by folder. Each folder contains the component logic, templates (e.g., Button.astro), and specific types.
  • themes/: CSS themes and component-specific styles.
  • astro/: Public entry point and barrel exports for Astro-based projects.
• The Documentation Site (src/): The Astro site implementation, located in src/pages, src/layouts, and src/components.

Run the documentation site locally for development:

pnpm install
pnpm dev

1. Create a folder in packages/opui/components/[ComponentName].
2. Add [ComponentName].astro to that folder.
3. Export the component from the barrel in packages/opui/astro/index.ts.
4. (Optional) Implement the component CSS in packages/opui/css/components/.