You may modify the style sheet in any way you wish ... For recognition, inspiration, and a resource we can all refer to when making the case for CSS-based design. This is sorely needed, even today.

This definition explains the meaning of CSS (cascading style sheets) and how using them with HTML pages is a user interface (UI) development best practice that complies with the separation of concerns ...

Learn how to use CSS pseudo-elements to style content that does not actually exist in your HTML, like ::before and ::after ...

Implementation: CSS Cascading Style Sheets (CSS ... Testing links and media playback as well as user interface design will inform evaluation.