Developers who want to dive deeper into the techy stuff shouldn’t miss this in-depth guide on dark mode on the web.

That being said, it’s time now to explore the most interesting features of Twenty Twenty-One for theme developers.

As mentioned above, Twenty Twenty-One is based on Seedlet, a two-column theme, with a footer sidebar and three menu locations. The styling of Seedlet is completely based on CSS custom properties and this makes it easier for theme developers and advanced users to build child themes upon Automattic’s theme.

The same is for Twenty Twenty-One. The new default theme comes with a single column layout, a footer sidebar, and two menu locations. The stylesheet mirrors the system of nested custom properties provided by Seedlet and this makes Twenty Twenty-One a perfect canvas to build child themes and highly customized websites.