Automatically adjusting the camera view

Description

've built a basic Pong game, however, I'm facing issues when it comes to different aspect ratios of the screen. The problem's main cause is the camera whose view is dependent on the screen size.

You can see my default camera settings in the picture below.

Resizing the scene view (or, generally speaking, the screen size, either in the development mode or in the release version) leads to this situation:

Question

What is the best way to overcome my issue?

I thought of having a script which automatically adjusts the camera, so the view will fully cover my playing field. Unfortunately, this introduces a new problem/context of the problem:

a) I want my game to be fullscreen, i.e. not containing any letterboxes, and

b) I am therefore fully responsible for automatic scaling of all objects (the paddles, the outer border, etc. – except the ball and few others).

Does anyone know a more elegant solution? Is any library/script for managing such cases already available?