Storyline Dark and Light Theme Sync

var existingLink = document.querySelector('link[href="html5/data/css/output.min.css"][data-noprefix]');
if (existingLink) {
    existingLink.setAttribute("id", "theme-stylesheet");
}
  function setTheme() {
            const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
            const themeLink = document.getElementById("theme-stylesheet");

            if (prefersDark) {
                themeLink.href = "dark.css";
            } else {
                themeLink.href = "light.css";
            }
        }

        setTheme();
        window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", setTheme);