let
  centerWindows = [
    "center, ^(gnome-characters)$"
    "center, ^(mpv)$"
    "center, ^(nomacs)$"
  ];
  opaqueWindows = builtins.map (x: "opaque, " + x) [
    "^(firefox)$"
    "^(org.kde.kdenlive)$"
    "^(krita)$"
    "^(mpv)$"
    "^(Brave-browser)$"
    "^(Gimp-2.10)$"
    "^(org.kde.okular)$"
    "^(vlc)$"
    "^(obsidian)$"
  ];
in
  centerWindows ++ opaqueWindows