Chrome Extension is basically just HTML, CSS, and JavaScript files.

I made once [taishikato/PinWeb](https://github.com/taishikato/PinWeb).

[popup.html](https://github.com/taishikato/PinWeb/blob/master/dist/popup.html) is the main HTML file.

[style.css](https://github.com/taishikato/PinWeb/blob/master/dist/style.css) is for CSS.

[main.js](https://github.com/taishikato/PinWeb/blob/master/dist/main.js) is for JavaScrip in this case.

Please don't think chrome extension complicated. This is almost the same as the website👌

I'm looking to build out my web application into a chrome extension but honestly am not too sure where to start. I don't know if there's a library with which you can build extension from (maybe that's a project someone could pick up) but would someone mind explaining how exactly Chrome Extensions are constructed and what the best course of action is to building one (or any resources you may know of). 

How do you build out a Chrome Extension and is there a recommended Javascript library to do so? 