February 9 we introduced CSS (Cascading Style Sheets), which controls how HTML elements look in the browser, as well as the hyperlink tag <a>. I’ve broken it down into a few core topics, with links to external references and our own guides on OpenLab. (The feature image is by Diana Smith, who creates realist portraits using HTML and CSS).

CSS Fundamentals
The CSS Box Model and Size-Related Properties

simple diagram of the CSS box model

CSS Typography Essentials
Block Appearance Basics
The <a> Tag (hyperlinks)