        document.getElementById('navigation').classList.remove('navbar-light')
                document.getElementById('navigation').classList.add('navbar-dark')
                document.getElementById("themeLight").hidden = false;
                document.getElementById("themeDark").hidden = true;
                // bootstrap related settings
                document.getElementsByTagName("html")[0].setAttribute("data-bs-theme", "dark");
                document.documentElement.style.setProperty("--bs-body-