What steps should I take to ensure my Nest.js app deployed on AWS Fargate displays properly on the Public IP without specifying the port number?

So I have deployed a Nest.js app to AWS Fargate. The thing is when I access the Public IP X.XXX.XXX.XXX the site does not open. But when I type X.XXX.XXX.XXX:3000 the page displays the Hello World! message. Now how can I make the app display it on X.XXX.XXX.XXX?

I have changed the port number of the app to 80 in the main.ts then i opened the command prompt with administrative privileges and typed npm start. The "Hello World!" message displayed. So my question is that do I need to then, modify the inbound rules of the security group of my Fargate Task to allow traffic on port 80 from the desired sources?