The nano-theme from kengchichang

GNU Emacs / N Λ N O Theme

A consistent theme for GNU Emacs. The light theme is based on Material colors and the dark theme is based on Nord colors.

The theme is based on a set of six faces (only):

Critical face is for information that requires immediate action.

It should be of high constrast when compared to other faces. This can be realized (for example) by setting an intense background color, typically a shade of red. It must be used scarcely.
Popout face is used for information that needs attention.

To achieve such effect, the hue of the face has to be sufficiently different from other faces such that it attracts attention through the popout effect.
Strong face is used for information of a structural nature.

It has to be the same color as the default color and only the weight differs by one level (e.g., light/regular or regular/bold). IT is generally used for titles, keywords, directory, etc.
Salient face is used for information that are important.

To suggest the information is of the same nature but important, the face uses a different hue with approximately the same intensity as the default face. This is typically used for links.
Faded face is for information that are less important.

It is made by using the same hue as the default but with a lesser intensity than the default. It can be used for comments, secondary information and also replace italic (which is generally abused anyway
Subtle face is used to suggest a physical area on the screen.

It is important to not disturb too strongly the reading of information and this can be made by setting a very light background color that is barely perceptible.

Install with straight.el:

(straight-use-package '(nano-theme :type git :host github
                                   :repo "rougier/nano-theme"))

... or install with quelpa:

(use-package nano-theme
  :ensure nil
  :defer t
  :quelpa (nano-theme
           :fetcher github
           :repo "rougier/nano-theme"))

Load theme directly: M-x: (load-theme 'nano t)

Alternatively, you can type:

If you want the same aspect as in the screenshots, you can also use M-x: (nano-mode)