Commenting SetBackdropColor line won't fix it:
Code:
local backdrop = {
bgFile = "Interface\\Buttons\\WHITE8x8",
edgeFile = "Interface\\AddOns\\zAddOn\\media\\outer_shadow",
tile = false,
tileSize = 32,
edgeSize = 6,
insets = { left = 6, right = 6, top = 6, bottom = 6 },
}
GameTooltip:SetBackdrop(backdrop)
GameTooltip:SetBackdropColor(20, 20, 20, 1)
GameTooltip:SetBackdropBorderColor(0, 0, 0, 1)
Visually:
