Alacritty themes files with colors from penumbra
Clone repository of put files where you want (my preference is ~/.config/alacritty/alacritty-theme-penumbra)
Copy files content in your config file or use Alacritty themes or import in your alacritty.yml :
import:
- ~/.config/alacritty/alacritty-theme-penumbra/penumbra-dark++.yml