use gradient color in flutter in Color instace code example

Example 1: color gradient in flutter

decoration: BoxDecoration(
    gradient: LinearGradient(
      colors: [Colors.green, Colors.blue])
  ),

Example 2: add gradient bg to container in flutter

body: Container(
  decoration: BoxDecoration(
    gradient: LinearGradient(
      colors: [Colors.green, Colors.blue])
  ),
  child: Center(
    child: Text('Gradients are cool!',
      style: TextStyle(
        fontSize: 35,
        color: Colors.white,
      ),
    ),
  ),
),