Functional CSS

A utility CSS library where class names are plain CSS property-value pairs.

FCSS is framework-agnostic, runtime-free, and intentionally literal. If a developer knows CSS, the class names should already make sense.

DocumentationGitHub

Status

The public packages, CLI, framework integrations, and purge pipeline are the surface this homepage will grow around.

Shape

  • One utility class emits one declaration.

  • Class names use natural CSS names instead of abbreviations.

  • Responsive, pseudo-state, and ARIA-state variants follow the same naming model.