beginner having trouble with A record

I have deployed a flask application in a ec2 instance here: http://52.49.186.217/
I have purchased a domain cats-vs-dogs.fun on name.com and created an A record as you can see in the picture.
I also restarted the Nginx server (just in case).
The static IP works fine but I cannot access the application going to www.cats-vs-dogs.fun, I get instead Nginx welcome page :(

What am I missing? It is my first time using Nginx