how to change color with gradient in dart code example

Example 1: gradient container flutter

decoration: BoxDecoration(
            gradient: LinearGradient(
                colors: [
                  const Color(0xFF3366FF),
                  const Color(0xFF00CCFF),
                ],
                begin: const FractionalOffset(0.0, 0.0),
                end: const FractionalOffset(1.0, 0.0),
                stops: [0.0, 1.0],
                tileMode: TileMode.clamp,
            ),
          ),

Example 2: gradient widget flutter

GradientCard(
    gradient: Gradients.tameer,
    shadowColor: Gradients.tameer.colors.last.withOpacity(0.25),
    elevation: 8,
);