app.css (or app.scss)

The app.css (or app.scss) file contains the global styles for the app. The name of the file is important, since this file is automatically loaded when the app starts.

Platform specific styles ​

Platform specific styles can be defined in app.<platform>.(css|scss)

Using other CSS plugins ​

You can use any number of CSS plugins you'd like in your project.

For example, you can use Tailwind CSS using @nativescript/tailwind