Twenty Twenty-One has been developed upon a new Automattic’s theme, the Seedlet theme, which provides a clean and well-ordered structure of nested CSS custom properties. Due to the large usage of CSS properties in the theme’s stylesheet, building child themes upon Twenty Twenty-One is quick and easy.

Twenty Twenty-One is a highly accessible, minimalist WordPress theme with a single column layout, a footer sidebar, and two menu locations: Primary navigation and Footer navigation.

The new theme uses a system font stack. This should have several benefits for both users and developers:

* First and foremost, using a system font stack brings benefits to UX and performance because native fonts are already supported by the majority of operating systems and don’t require extra load time.