campfire/Assets/Scripts/PauseMenu.cs

using UnityEngine;

[RequireComponent(typeof(CanvasGroup))]
public class PauseMenu : MonoBehaviour {
    public bool Paused = false;

    private CanvasGroup Canvas;

    private void Awake() {
        Canvas = GetComponent<CanvasGroup>();
        Canvas.alpha = Paused ? 1 : 0;
    }

    private void Update() {
        if (Input.GetKeyDown(KeyCode.Escape)) {
            Paused = !Paused;
        }

        Time.timeScale = Mathf.Lerp(Time.timeScale, Paused ? 0 : 1, 10f * Time.unscaledDeltaTime);
        Canvas.alpha = Mathf.Lerp(Canvas.alpha, Paused ? 1 : 0, 10f * Time.unscaledDeltaTime);
    }
}