Multiple Websites with one Service

Hi, I'm new to Serverless Architecture but would like to build a website using it. If this is not the correct place to ask such questions, please let me know where to go.

My goal is to minimize the amount of work I have to do, should I need to do any changes either with UI or backend.

I want to make multiple sports websites which are all pretty similar but obviously will have some differences since they will be specific to either baseball, football, etc... Now if I come up with a new feature, I would like to implement the change only once and make sure all websites have it, like for example showing users who are online.

Now, is it possible to create a sort of a template website where CSS and other controls are then loaded based on the website URL? So, basketball url would load the basketball website components, while the baseball url would load the baseball website components.

Also, the users would not be the same on all websites. They may register on several or only one website. The point is, different URLs should point to the same serverless app.

Would this plugin be of any help?

https://github.com/serverless/examples/tree/master/aws-node-serve-dynamic-html-via-http-endpoint

The issue does not name a repository file, test, or implementation entry point. Start by reviewing the linked aws-node-serve-dynamic-html-via-http-endpoint example and clarify the required routing, per-site UI, and user separation before proposing a change. Done would require agreed requirements and a concrete implementation scope.