CameraController.cs

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

public class CameraController : MonoBehaviour
{
    public float sensX;
    public float sensY;

    public Transform orientation;

    float xRotation;
    float yRotation;


    void Start(){
        
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }


    void Update(){

        float mouseX = Input.GetAxisRaw("Mouse X") * Time.deltaTime * sensX;
        float mouseY = Input.GetAxisRaw("Mouse Y") * Time.deltaTime * sensY;

        yRotation = yRotation + mouseX;

        xRotation = xRotation - mouseY;

        xRotation = Mathf.Clamp(xRotation, -90f, 90f);


        transform.rotation = Quaternion.Euler(xRotation, yRotation, 0);
        orientation.rotation = Quaternion.Euler(0, yRotation, 0);

    }
    
}