Movement and zoom of camera on the map

Hello, I'm trying to write a small 2d strategy, and I want to realize the movement of the camera with the mouse I have a pre-drawn map, which has a size 210x130 in Unity. I have a GameObject attachment with the camera, I move the GameObject the following script: using UnityEngine; using System.Collections;

 public class MoveCamera : MonoBehaviour {
 
 
     public float leftRestriction = -40f;
     public float rightRestriction = 10f;
     public float upRestriction = 30f;
     public float downRestriction = -10f;
 
     // Use this for initialization
     public int theScreenWidth;
     public int theScreenHeight;
     public int Boundary = -10;
 
     public int speed = 10;
     // Use this for initialization
     void Start ()
     {
         theScreenWidth = Screen.width;
         theScreenHeight = Screen.height;
 
     }
     
     // Update is called once per frame
     void Update ()
     {
 
         // Right
             if (Input.mousePosition.x > theScreenWidth - Boundary && transform.position.x <= rightRestriction)
         {
             float posX = transform.position.x;
             posX += speed * Time.deltaTime;
             transform.position = new Vector3(posX, transform.position.y, transform.position.z);
         }
         //Left
         if (Input.mousePosition.x < 0 + Boundary && transform.position.x >= leftRestriction)
         {
             float posX = transform.position.x;
             posX -= speed * Time.deltaTime;
             transform.position = new Vector3(posX, transform.position.y, transform.position.z);
         }
 
         //Up
         if (Input.mousePosition.y > theScreenHeight - Boundary && transform.position.y <= upRestriction)
         {
             float posY = transform.position.y;
             posY += speed * Time.deltaTime;
             transform.position = new Vector3(transform.position.x, posY, transform.position.z);
         }
 
         //Down
         if (Input.mousePosition.y < 0 + Boundary && transform.position.y >= downRestriction)
         {
             float posY = transform.position.y;
             posY -= speed * Time.deltaTime;
             transform.position = new Vector3(transform.position.x, posY, transform.position.z);
         }
     }
 }
 

Everything works fine but if I change the size of the camera, I can see the blue area. I worked with a zoom camera like this:

 using UnityEngine;
 using System.Collections;
 
 public class ZoomCamera : MonoBehaviour {
 
     public float zoomSpeed = 1;
     public float targetOrtho;
     public float smoothSpeed = 2.0f;
     public float minOrtho = 1.0f;
     public float maxOrtho = 20.0f;
     // Use this for initialization
     void Start()
     {
         targetOrtho = Camera.main.orthographicSize;
     }
 
     // Update is called once per frame
     public float lastOrtho;
     void Update()
     {
         float scroll = Input.GetAxis("Mouse ScrollWheel");
         if (scroll != 0.0f)
         {
             targetOrtho -= scroll * zoomSpeed;
             targetOrtho = Mathf.Clamp(targetOrtho, minOrtho, maxOrtho);
         }
 
         Camera.main.orthographicSize = Mathf.MoveTowards(Camera.main.orthographicSize,          targetOrtho, smoothSpeed * Time.deltaTime);
     }
 
 
     public GameObject MoveCamera;
 
 }
 

Could you tell me how to do so that when i change the size there is not the blue area. Maybe it is necessary to shift the camera with certain conditions, but I don't understand what conditions and how. I beg your help