increase font in text in flutter code example

Example 1: how to set font family in flutter

MaterialApp(
  title: 'Custom Fonts',
  // Set Raleway as the default app font.
  theme: ThemeData(fontFamily: 'Raleway'),
  home: MyHomePage(),
);

Example 2: TextStyle underline flutter

Text(
  'Hello world',
  style: TextStyle(
    decoration: TextDecoration.underline,
  ),
)