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A markdown CSS module that is rather modest.
W3.CSS is a modern CSS framework with built-in responsiveness:
YAML (Yet Another Multicolumn Layout) is a modular CSS framework for truly flexible, accessible and responsive websites. It is based on Sass and has a very slim framework core that weights only ~6kB.
A lightweight CSS framework written in BEM and SASS for building scalable component-based user interfaces
A collection of LESS mixins and variables for writing better CSS.
Graceful & Minimal CSS design system in pure semantic HTML
Collection of common CSS mistakes, and how to fix them
CSS In A Nutshell
Code Style Guidelines
Naming Conventions & Methodologies
CSS In JS
CSS Working Group
CSS Development At Large-Scale Websites
Reset And Normalize
Style Guide Generators
Custom Properties (aka CSS Variables)