inventory/Runtime/UI/FollowWorldPosition.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;

namespace KairoEngine.Inventory
{
    public class FollowWorldPosition : MonoBehaviour
    {
        public ItemContainerUi ItemContainerUi;
        public GameObject panel;
        public float yDistance = 2;
        private Transform target;

        void OnEnable()
        {
            
        }

        void Update()
        {
            if(panel.activeSelf)
            {
                target = ItemContainerUi.targetItemContainer.transform;
                if(target != null)
                {
                    Vector3 pos = new Vector3(target.position.x, target.position.y + yDistance, target.position.z);
                    Vector3 screenPos = Camera.main.WorldToScreenPoint(pos);
                    screenPos.z = 100;
                    panel.GetComponent<RectTransform>().position = screenPos;
                }
            } 
        }
    }
}