nixos-config/config/modules/theme.nix

{
  border-radius = 5;
  colors = {
    background = "#282A2E";
    background-alt = "#373B41";

    foreground = "#C5C8C6";

    primary = "#F0C674";
    secondary = "#8ABEB7";

    alert = "#A54242";
    disabled = "#707880";
  };
  sizing = rec {
    xs = 1;
    s = 2;
    m = 4;
    l = 8;
    xl = 16;

    str = {
      xs = toString xs;
      s = toString s;
      m = toString m;
      l = toString l;
      xl = toString xl;
    };
  };
}