 app.setAttribute("light-mode", "dark");
            } else {
                app.setAttribute("light-mode", "light");
            }
        }, false);
        var app = document.getElementsByTagName("BODY")[0];
        if (localStorage.lightMode == "dark") {
            app.setAttribute("light-mode", "dark");
        }
    </script>
    <div class="container">
        <h1>Dark Mode Toggle</h1>
        <button class="light-mode-button" aria-label="Toggle Light Mode" onclick="toggle_light_mode()">
          