how to add gradient in flutter 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: custom gradient flutter

BoxDecoration(
      gradient: LinearGradient(
        colors: [
          AppColors.roseGradientColor,
          AppColors.purpleInAppGradientColor,
          AppColors.blueInAppGradientColor
        ],
        begin: Alignment(-0.7,12),
        end: Alignment(1,-2),
      ),
        borderRadius: BorderRadius.only(bottomLeft: Radius.circular(25),bottomRight: Radius.circular(25))
    )

Example 3: gradient widget flutter

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