Prevent object from going beyond unity screen boundaries?

Question

C++ / C#

Hello.

Please tell me how to prevent the object from going beyond the screen. Need to restrict motion at 1080 x 1920 resolution (Portrait screen layout).

I will be very grateful to everyone who will help.

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

public class ScreenLimite : MonoBehaviour
{
    private Vector2 screenBounds;
    // Start is called before the first frame update
    void Start()
    {
        screenBounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
    }

    // Update is called once per frame
    void LateUpdate()
    {
        Vector3 viewPos = transform.position;
        viewPos.x = Mathf.Clamp(viewPos.x, screenBounds.x, screenBounds.x * -1);
        viewPos.y = Mathf.Clamp(viewPos.y, screenBounds.y, screenBounds.y * -1);
        transform.position = viewPos;

    }
}

When I run the test, the object disappears from the screen and rushes from the bottom left corner of the screen to the top right (Or vice versa)