Class1.cs

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

public class Cameracontrol : MonoBehaviour
{
    public float RotationSpeed = 1;
    public Transform Target, Player;
    float mouseX, mouseY;
    void Start()
    {
        Cursor.visible = false;
        Cursor.lockState = CursorLockMode.Locked;
    }
    void LateUpdate()
    {
        CamControl();
    }
    void CamControl()
    {

        mouseX += Input.GetAxis("Mouse x") * RotationSpeed;
        mouseY -= Input.GetAxis("Mouse Y") * RotationSpeed;
        mouseY = Mathf.Clamp(mouseY, -35, 60);
        transform.LookAt(Target);
        Target.rotation = Quaternion.Euler(mouseY, mouseX, 0);
        Player.rotation = Quaternion.Euler(0, mouseX, 0);

    }
}