[Unity] Parallax effect can be obtained by attaching to multiple Images

ParallaxUI.cs

using UnityEngine;

/// <summary>
/// RectTransformをマウスの位置に応じて動かすコンポーネントです
/// 複数のImageなどにつけることで、Parallax的な効果を得られます
/// </summary>
[RequireComponent(typeof(RectTransform))]
public class ParallaxUI : MonoBehaviour
{
    [SerializeField] private float moveAmount = 10f;
    private RectTransform rectTransform;
    private Vector3 initialLocalPos;

    private void Start()
    {
        rectTransform = GetComponent<RectTransform>();
        initialLocalPos = rectTransform.localPosition;
    }

    private void Update()
    {
        Vector2 mousePos = Input.mousePosition;
        var screenSize = new Vector2(Screen.width, Screen.height);
        var normalized = (mousePos - screenSize * 0.5f) / (screenSize * 0.5f);
        var offset = new Vector2(normalized.x * moveAmount, normalized.y * moveAmount);
        rectTransform.localPosition = initialLocalPos + (Vector3)offset;
    }
}