Site building · Website glossary

CSS

Quick answer · What is CSS?

Cascading Style Sheets define how web content is presented, including layout, typography, spacing, and visual states.

IN PRACTICE

CSS: an example

A stylesheet changes a card grid from three columns to one on a narrow screen.

KEEP IN MIND

A visual change should preserve usable reading order, contrast, and focus visibility.

Put the idea to work

Frequently asked questions

What is a practical example of CSS?

A stylesheet changes a card grid from three columns to one on a narrow screen.

What should I preserve when changing CSS presentation?

A visual change should preserve usable reading order, contrast, and focus visibility.

Which concepts should I read alongside CSS?

HTML: HyperText Markup Language expresses the structure and meaning of web content with elements and attributes.
Responsive design: An approach that adapts content presentation to available space and device characteristics.