Responsive Notifications Page Using Tailwind CSS & Vanilla Javascript

I used this as an opportunity to practice loading content via javascript. I created a data object and loaded the content via the data object (as if the data came from an API or database).

My big question is, how can I prevent the empty notifications page from flickering before javascript pulls in the notifications? I'd like to add a template like many sites do and display that until the javascript loads with all the notifications. Any help is much appreciated. Thanks!