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;
    };
  };
}