how do i stop my draggable gui from bein able to drag off screen

[real vigil]

local frame = script.Parent
local UserInputService = game:GetService("UserInputService")

local dragging
local dragInput
local dragStart
local startPos

local function update(input)
local delta = input.Position - dragStart
frame.Position = UDim2.new(startPos.X.Scale, startPos.X.Offset + delta.X, startPos.Y.Scale, startPos.Y.Offset + delta.Y)
end

frame.InputBegan:Connect(function(input)
if input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch then
dragging = true
dragStart = input.Position
startPos = frame.Position

    input.Changed:Connect(function()
        if input.UserInputState == Enum.UserInputState.End then
            dragging = false
        end
    end)
end

end)

frame.InputChanged:Connect(function(input)
if input.UserInputType == Enum.UserInputType.MouseMovement or input.UserInputType == Enum.UserInputType.Touch then
dragInput = input
end
end)

UserInputService.InputChanged:Connect(function(input)
if input == dragInput and dragging then
update(input)
end
end)

in other words how do i make a border on all sides

[brisk barn]

i gotchu

[livid pewter]

Try adding max and min limit for both X and Y of the screen

Yo the drag