protonmail-yaru is a ProtonMail Beta Theme (eventually a Protonmail 2.0 Theme) aimed to imitate the look and feel of the new Ubuntu 20.04 Yaru Theme. Looks best on Ubuntu, especially when paired with Firefox. Other flavors coming soon.
- Pick the theme you like from the themes folder in the repository.
- Select the theme and select the code view.
- Select everything, make sure you have absolutely everything selected, and copy the code.
- On ProtonMail's website, click on Settings, then in the Appearance column, click Themes.
- In the Custom Theme option, delete any CSS that appears, then paste the new CSS code from your clipboard and press save.
- Finally, make sure to refresh the page so all the changes can take effect.