Check out example codes for "unity background camera". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;
using System.Collections;

public class Myclass: MonoBehaviour
{
    public Color Red = Color.red;
    
    public Camera cam;

    void Start()
    {
      
      
    }

    void Update()
    {
      
        cam.backgroundColor = Red;
    }
}

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