This is how the gui looks like when the uistroke’s transparency is set to 1:
I’m changing it through a localscript:
for i = 1,10,1 do
print(i)
player.PlayerGui.NPCS.NPC1.Popup.BackgroundTransparency +=0.1
player.PlayerGui.NPCS.NPC1.Popup.UIStroke.Transparency +=0.1
player.PlayerGui.NPCS.NPC1.Popup.QuestName.TextTransparency +=0.1
player.PlayerGui.NPCS.NPC1.Popup.QuestName.UIStroke.Transparency +=0.1
player.PlayerGui.NPCS.NPC1.Popup.QuestText.TextTransparency +=0.1
player.PlayerGui.NPCS.NPC1.Popup.QuestText.UIStroke.Transparency +=0.1
wait(0.2)
end