Low-level CSS Toolkit

v4.0.0 · 10KB (2KB gzipped)

Modular CSS toolkit based on OOCSS principles

Basscss is a lightweight collection of base element styles, utilities, layout modules, and color styles designed for speed, performance, and scalability.


10KB minified, 2KB gzipped


Composable and highly reusable styles

Consistent and Flexible

Smart defaults balanced with basic utility


Performant and simple design to code faster

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Base Elements

Core typographic, form, button, and base element styles keep designs consistent where it matters most.

Utility Styles

Simple, composable typographic and layout utilities based on common scales promote faster design and development in the browser and more performant, more readable code.


Layout Modules

Flexible, responsive, and reusable layout modules control page structure across a wide variety of devices.


Simple, concrete color utilities encourage iterative design and flexibility over time.


Get Started

View the docs to download Basscss and learn more.