Una Kravets • 8/13/2025

5 Useful CSS functions using the new @function rule

This article introduces the new CSS @function rule, a game-changer for writing dynamic CSS. It provides five real-world examples: a negation function, an opacity function, a fluid typography function, a conditional border radius function, and a layout sidebar function, demonstrating how to create reusable logic for cleaner, more maintainable code in design systems.

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