Path related style sheet vulnerability

 Path related style sheet vulnerability is reported in DAST scan for the below code in ascx file

Code: <link type="text/css" rel="stylesheet" href="css/popup.css" />x

I tried the following fix but did not work

<script type="text/javascript"> document.addEventListener('DOMContentLoaded', () => { const base = document.createElement("base"); base.href = window.location.origin + "/"; document.head.appendChild(base); }); </script> <link type="text/css" rel="stylesheet" href='<%# ResolveUrl("~/css/popup.css")%>' />