c# Object Drag ScreenToWorldPoint Limits

Hello, I'm using the following code to allow my 'player' to be dragged around the screen in a 2d game. I would like to impose boundaries so the player cannot be dragged out side of the screen. I couldn't find anything on this, any help?

     private Vector3 screenPoint;
     private Vector3 offset;
     
     void OnMouseDown()
     {
         screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);
         
         offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
         
     }
     
     void OnMouseDrag()
     {
         Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
         
         Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint)+offset;
         transform.position = curPosition;
         
     }

Thanks.