Let's start by taking a look at our app's main app.css file inside the App directory:
/*In NativeScript, the app.css file is where you place CSS rules thatyou would like to apply to your
entire application. Check outhttp://docs.nativescript.org/ui/styling for a full list of the CSSselectors and
properties you can use to style UI components./*For example, the following CSS rule changes the font size
of all UIcomponents that have the btn class name.*/.btn { font-size: 18;}/*In many cases you may want to use the NativeScript core theme insteadof writing your own CSS rules. For a full list
of class names in the themerefer to http://docs.nativescript.org/ui/theme.*/@import 'nativescript- theme-core/css/core.light.css'; ...
