This site promises “everything you need to learn CSS Grid Layout” and it delivers, with examples of specific properties, higher-level samples of common design patterns, and even video tutorials.

Pure CSS offers a minimalist, mobile-first approach to CSS layouts in your web pages. ... with more than 22,000 stars on GitHub as of this writing. Mobile-first CSS development.

GitHub Enterprise Server 3.9 introduces a time-based roadmap layout in GitHub Projects, allowing users to view project issues and pull requests on a timeline.