AlertUI

function alert(txt,plr,duration)
if not duration then
	duration = 10
end
local SysAlert = Instance.new("ScreenGui")
local SysAlertFrame = Instance.new("Frame")
local FrameEffects = Instance.new("Frame")
local AlertTxt = Instance.new("TextLabel")

SysAlert.Name = "SysAlert"
SysAlert.Parent = plr.PlayerGui
SysAlert.ResetOnSpawn = false

SysAlertFrame.Name = "SysAlertFrame"
SysAlertFrame.Parent = SysAlert
SysAlertFrame.BackgroundColor3 = Color3.new(0, 0, 0)
SysAlertFrame.BorderSizePixel = 0
SysAlertFrame.Size = UDim2.new(0, 0, 0.100000001, 0)
SysAlertFrame:TweenSize(UDim2.new(1, 0, 0.100000001, 0))
SysAlertFrame.Position = UDim2.new(0,0,0.45,0)

FrameEffects.Name = "FrameEffects"
FrameEffects.Parent = SysAlertFrame
FrameEffects.BackgroundColor3 = Color3.new(1, 1, 1)
FrameEffects.BorderSizePixel = 0
FrameEffects.Position = UDim2.new(0.0250000004, 0, 0.824999988, 0)
FrameEffects.Size = UDim2.new(0.949999988, 0, 0.0250000004, 0)

AlertTxt.Name = "AlertTxt"
AlertTxt.Parent = SysAlertFrame
AlertTxt.BackgroundColor3 = Color3.new(1, 1, 1)
AlertTxt.BackgroundTransparency = 1
AlertTxt.Position = UDim2.new(0.0250000004, 0, 0, 0)
AlertTxt.Size = UDim2.new(0.949999988, 0, 0.800000012, 0)
AlertTxt.Font = Enum.Font.SourceSansLight
AlertTxt.FontSize = Enum.FontSize.Size14
AlertTxt.Text = txt
AlertTxt.TextColor3 = Color3.new(1, 1, 1)
AlertTxt.TextScaled = true
AlertTxt.TextWrapped = true
AlertTxt.TextXAlignment = Enum.TextXAlignment.Left

delay(duration,function()
	for i,v in pairs(SysAlertFrame:GetChildren()) do
		if v:IsA("TextLabel") or v:IsA("TextButton") then
			v.Text = ""
		end
	end
	SysAlertFrame:TweenSize(UDim2.new(0,0,0.100000001,0))
	delay(1,function() SysAlert:Destroy() end)
	end)
end
function alertall(txt,duration)
	for i,v in pairs(game.Players:GetChildren()) do
		alert(txt,v,duration)
	end
end

alertall('test',10)