RainbowBorder script

local stroke = Instance.new("UIStroke")
stroke.Parent = MainFrame
stroke.Thickness = 5
stroke.ApplyStrokeMode = Enum.ApplyStrokeMode.Border

local hue = 0

task.spawn(function()
	while true do
		hue += 0.01
		if hue > 1 then
			hue = 0
		end
		
		stroke.Color = Color3.fromHSV(hue,1,1)
		task.wait()
	end
end)