A custom theme building in features of Gutenberg as they come.
The lithosphere is the solid, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth's structure. This theme is a foundation which will be built on by Gutenberg. With the functionality below and styling above.
02/01/2020: Adds in dark switcher props to https://github.com/ananyaneogi for the code snippet 04/01/2020: Updated colors across sites and rolled out onto all. Adds variables to block styles also.