Interactive playground to generate pure CSS Flexbox layouts visually.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Change standard CSS flex rules using the dropdowns (e.g. justify-content: center).
Watch the interactive canvas elements align automatically.
Copy the standard CSS flexbox rules directly into your stylesheet.
Flexbox (Flexible Box Layout Module) is a one-dimensional layout model in CSS optimized for designing complex UI layouts and alignment.
The gap property defines the size of the gap between rows and columns, replacing older margin-based hacks.
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