In reply to Sam.

Are there specific elements you’re talking about?

To me, this looks like a full screen mode with default blocks. Make sure to have the “Gutenberg” plugin installed, so you get the latest features (it takes precedence over the version shipped in WP core).

We’re currently in the process of developing a large theme with Gutenberg. In our theme setup, most styles are shared between the editor and the frontend, where the editor receives some extra CSS rules (since nesting etc. is different there). With this we’re trying to achieve exactly that: Make the backend look as close as possible as the frontend will look – without code duplication.