Buefy

Lightweight UI components for Vue.js based on Bulma.

Shoelace

Another CSS framework but quite easy to grasp and lightweight.

A [fun] game for learning CSS flexbox

(explained with big, colorful, animated gifs)

Creates CSS to implement CSS Grids.

Great beginners (and beyond) tutorial for web development.

Small CSS framework with forms and grids

Create fast loading, highly readable, and 100% responsive interfaces with as little css as possible.

Low-Level CSS Toolkit

The evolution of Medium’s CSS strategy

Vertical centering witchcraft. Still nostalgic for a good old…

<table height="100%"><tr><td>Vertically aligned</td></tr></table>

Fully justified text (via SVG)

Support tables for HTML5, CSS3, etc

Some HTML, CSS and JS best practices.

Responsive CSS boilerplate

List of cursors available through CSS