It's time to get classy

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'; ...

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