most simple map panner

public class MapCamera : MonoBehaviour {
    public float panSpeed = 1;

    private bool isDragging;
    private Vector2 lastMousePos;

    // Update is called once per frame
    void Update () {
        //When clicking the mouse down
        if(Input.GetMouseButtonDown(0)) {
            isDragging = true;
            lastMousePos = Input.mousePosition;
        }

        //While dragging
        if(Input.GetMouseButton(0)) {
            transform.Translate(new Vector3(Input.mousePosition.x - lastMousePos.x, 0, Input.mousePosition.y - lastMousePos.y) * Time.deltaTime * panSpeed * -1);
            lastMousePos = Input.mousePosition;
        }

        //When releasing the mouse
        if(Input.GetMouseButtonUp(0)){
            isDragging = false;
        }
    }
}