My_GUI

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class My_GUI : MonoBehaviour
{
    // Start is called before the first frame update
    private Camera _camera;
    void Start()
    {
        _camera = GetComponent<Camera>();
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    // Update is called once per frame
    void OnGUI()
    {
        int size = 40;
        float posX = _camera.pixelWidth / 2 - size / 4;
        float posY = _camera.pixelHeight / 2 - size / 4;
        GUI.Label(new Rect(posX, posY, size, size), "*");
    }
}