How do I lock the players mouse in the center of their screen?

I've been looking everywhere for this. I'm going to make a horror game where it's always first person and your mouse is in the middle of your screen and it's a white dot. I really, really want to know how to lock my mouse in the center of my screen. If you see this and know the answer, please don't ignore if you know the answer.

Remember to use google as well

-------------
--- INDEX ---
-------------

--Services
local userInputService = game:GetService("UserInputService")
local runService = game:GetService("RunService")

--Player & Character
local localPlayer = game:GetService("Players").LocalPlayer

--Other
local Camera = game:GetService("Workspace").CurrentCamera

--------------
--- VALUES ---
--------------

local xAngle = 0
local yAngle = 0
local cameraPos = Vector3.new(3.5,0,7.5)

----------------------
--- INITIALIZATION ---
----------------------

wait(1)
Camera.CameraType = Enum.CameraType.Scriptable
userInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

-----------------
--- FUNCTIONS ---
-----------------

userInputService.InputChanged:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseMovement then
		xAngle = xAngle-input.Delta.x*0.4
		--Clamp the vertical axis so it doesn't go upside down or glitch.
		yAngle = math.clamp(yAngle-input.Delta.y*0.4,-80,80)
	end
end)

runService.RenderStepped:Connect(function()
	local Character = localPlayer.Character
	local rootPart = Character:FindFirstChild("HumanoidRootPart")
	if Character and rootPart then
		--Set rotated start cframe inside head
		local startCFrame = CFrame.new((rootPart.CFrame.p + Vector3.new(0,2,0)))*CFrame.Angles(0, math.rad(xAngle), 0)*CFrame.Angles(math.rad(yAngle), 0, 0)
		
		--Set camera focus and cframe
		local cameraCFrame = startCFrame + startCFrame:vectorToWorldSpace(Vector3.new(cameraPos.X,cameraPos.Y,cameraPos.Z))
		local cameraFocus = startCFrame + startCFrame:vectorToWorldSpace(Vector3.new(cameraPos.X,cameraPos.Y,-50000))
		
		Camera.CFrame = CFrame.new(cameraCFrame.p,cameraFocus.p)
	end
end)

I'm making an fps so here is the deploy 4 me

game.StarterGui.ScreenGui.Frame.DeployButton.MouseButton1Click:Connect(function()
game.StarterPlayer.CameraMode.LockFirstPerson = true

game.StarterGui.ScreenGui.Frame.DeployButton.MouseButton1Click:Connect(function()
game:GetService("Players")
local Mouse = Players.LocalPlayer:GetMouse()
Mouse.Icon = "www.roblox.com/asset?id=316279305"

I will test this out, if it works better

StarterPlayer MaxZoomDistance will be 0.5