Darker UI script

core.lua

local GetChildrenTree
local f = CreateFrame("Frame")
f:SetScript("OnEvent",function()
  GetChildrenTree(UIParent)
  end)
f:RegisterEvent("PLAYER_ENTERING_WORLD")
function GetChildrenTree(Parent)
  if Parent:GetChildren() then
    for _, Child in pairs({Parent:GetChildren()}) do
      for _,r in pairs({Child:GetRegions()}) do
        if r:GetObjectType() == "Texture" then
          r:SetVertexColor(0.2,0.2,0.2) -- 1.0 = 100% light, 0.0 = 100% dark, 0.2 = 20% brightness
        end
      end
      GetChildrenTree(Child)
    end
  end
end