A card with the option to change the shadow color and animation duration of the default card

shadow-card.dart

class ShadowCard extends StatelessWidget {
  const ShadowCard({
    Key key,
    this.color,
    this.elevation = 1.0,
    this.shape,
    this.margin = const EdgeInsets.all(4.0),
    this.clipBehavior = Clip.none,
    this.child,
    this.semanticContainer = true,
    this.shadowColor = Colors.grey,
    this.animationDuration = kThemeChangeDuration,
  }) : assert(elevation != null && elevation >= 0.0),
        super(key: key);

  final Color color;

  final double elevation;

  final ShapeBorder shape;

  final Clip clipBehavior;

  final EdgeInsetsGeometry margin;

  final bool semanticContainer;

  final Color shadowColor;
  
  final Duration animationDuration; 

  final Widget child;

  @override
  Widget build(BuildContext context) {
    return Semantics(
      container: semanticContainer,
      explicitChildNodes: !semanticContainer,
      child: Container(
        margin: margin ?? const EdgeInsets.all(4.0),
        child: Material(
          animationDuration: animationDuration,
          type: MaterialType.card,
          color: color ?? Theme.of(context).cardColor,
          elevation: elevation,
          shadowColor: shadowColor,
          shape: shape ?? const RoundedRectangleBorder(
            borderRadius: BorderRadius.all(Radius.circular(4.0)),
          ),
          clipBehavior: clipBehavior,
          child: child,
        ),
      ),
    );
  }
}