Themes are defined in themes. Those themes define the colors, fonts, icons, etc, used by Hyprland and the apps/programs installed.
You can change the selected theme by changing the import statement of your host's configuration.nix file.
Tip
To apply the theme to DuckDuckGo, follow the instructions in $HOME/.duckduckgo-colorscheme.js
Create a copy of one of the existing themes and change the variables. Wallpapers are loaded from the nixy-wallpapers repo.
