Besides all the JavaScript/TypeScript files, you will get CSS when you provision a new SharePoint Framework project. In this blog post, I try to explain just something simple. How to name your CSS files correctly and what difference your naming makes.
CSS is currently not capable of scoping the design only to a component on a web page. It is just possible through different class names for elements on the page. To avoid the inference of same style sheet classes on the same page, SPFx post-fix every class name used in the web parts CSS files. There are also hidden gems that allow you to change this behaviour dynamically as required and sometime the class names shouldn’t be renamed at all cost. Enough about the theory lets take a closer more detailed look.
