{ ... }:
{
  services.picom = {
    enable = true;
    backend = "glx";
    shadow = true;
    fade = true;
    activeOpacity = 1.0;
    inactiveOpacity = 0.8;
    settings = {
      blur = {
        # requires: https://github.com/ibhagwan/picom
        # method = "dual_kawase";
        method = "gaussian";
        size = 20;
        deviation = 15;
        strength = 7;
        background = false;
        background-frame = false;
        background-fixed = false;
        kern = "3x3box";
      };
    };
  };
}