(function() {
                var message = 'Your browser does not support modern JavaScript modules. Please upgrade your browser for the best experience.';
                var warningDiv = document.createElement('div');
                warningDiv.style.color = 'red';
                warningDiv.style.padding = '10px';
                warningDiv.style.margin = '10px 0';
                warningDiv.style.border = '1px solid red';
                warningDiv.style.backgroundColor = 'lightyellow';
                warningDiv.innerText = message;
                document.body.prepend(warningDiv);
            })();