Simple GUI

--Universal GUI
local player = game.Players.LocalPlayer
local gui = Instance.new("ScreenGui", player:WaitForChild("PlayerGui"))
gui.Name = "MarvLuxuryGui"
gui.ResetOnSpawn = false

local frame = Instance.new("Frame", gui)
frame.Size = UDim2.new(0, 300, 0, 400)
frame.Position = UDim2.new(0.5, -150, 0.5, -200)
frame.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
frame.Active = true
frame.Draggable = true

-- Animated grayscale border
local stroke = Instance.new("UIStroke", frame)
stroke.Thickness = 2
stroke.ApplyStrokeMode = Enum.ApplyStrokeMode.Border
task.spawn(function()
    local gray = 0
    local up = true
    while frame.Parent do
        stroke.Color = ColorSequence.new(Color3.fromRGB(gray, gray, gray))
        gray = up and gray + 5 or gray - 5
        if gray >= 255 then up = false end
        if gray <= 0 then up = true end
        task.wait(0.03)
    end
end)

-- Title
local title = Instance.new("TextLabel", frame)
title.Size = UDim2.new(1, 0, 0, 30)
title.BackgroundTransparency = 1
title.Text = "Universal GUI"
title.TextColor3 = Color3.new(1, 1, 1)
title.Font = Enum.Font.GothamBold
title.TextScaled = true

-- Glow effect
local function addGlow(btn)