nix-config/home/themes/dark/gtk.nix

{ pkgs, ... }:
{

    gtk = {
        enable = true;

        theme = {
            package = pkgs.flat-remix-gtk;
            name = "Flat-Remix-GTK-Grey-Darkest";
        };

        iconTheme = {
            package = pkgs.adwaita-icon-theme;
            name = "Adwaita";
        };

        font = {
            name = "Sans";
            size = 12;
        };
    };
}