One major benefit of block themes is that they can be built with very little CSS. For example, the Twenty Twenty-Three theme has none. All block styles are defined in a theme.json file. While theme.json is getting more powerful with each WordPress release, you will likely need to add some custom CSS in most projects.

This Online Workshop will explore ways to add custom CSS to a block theme while ensuring those styles work correctly in the Editor and on the site’s front end. If time permits, we will also discuss a Sass workflow you can employ to optimize per-block styles.