darken static method
Implementation
static Color darken(Color color, [double amount = .1]) {
if (amount < 0) amount = 0;
if (amount > 1) amount = 1;
final hsl = HSLColor.fromColor(color);
final hslDark = hsl.withLightness((hsl.lightness - amount).clamp(0.0, 1.0));
return hslDark.toColor();
}