Navigation themes
Navigation themes are a series of accessibility options developed in accordance with the Web Content Accessibility Guidelines (WCAG) standard. There are three navigation themes available on the Online Editor user interface: Light, Warm, and Dark. You can find them on the View tab, in the Theme group.
The Light theme is the one displayed by default.

The Warm theme includes warmer colors for the workspace and darker colors for the elements on the ribbon.

The Dark theme includes darker colors for both the workspace and the elements on the ribbon.

The Warm theme includes warmer colors for the workspace and darker colors for the elements on the ribbon.
The Dark theme includes darker colors for both the workspace and the elements on the ribbon.