react-native-navigation/example/src/screens/set/styles.js

export const navigatorStyle = {
  navBarHideOnScroll: true,
  drawUnderTabBar: true,
  navBarButtonColor: '#cacaca',
  navBarBackgroundColor: '#31363c',
  navBarTextColor: '#cacaca',
  tabBarBackgroundColor: '#31363c',
  tabBarButtonColor: '#cacaca',
  tabBarSelectedButtonColor: '#cacaca'
};

export const primaryDark = {
  backgroundColor: '#1f2222'
};

export const primaryLight = {
  backgroundColor: '#cacaca'
};

export const textLight = {
  color: '#cacaca'
};

export const textDark = {
  color: '#1f2222'
};