CSS

can i use css in react native

// A StyleSheet is an abstraction similar to CSS StyleSheets

const styles = StyleSheet.create ({
   myBeautifulStyle: {
      marginTop: 20,
      textAlign: 'center',
      color: 'blue',
      fontWeight: 'bold',
      fontSize: 20
   }
})

does react native use css

Not exactly CSS, the style names and values usually match how CSS works on 
the web, except names are written using camel casing, e.g. backgroundColor 
instead of background-color.