shadow method

Implementation

ContainerBuilder shadow() => boxShadow([
  BoxShadow(
    color: Colors.black.withValues(alpha: 0.06),
    blurRadius: 2,
    offset: const Offset(0, 1),
  ),
  BoxShadow(
    color: Colors.black.withValues(alpha: 0.04),
    blurRadius: 1,
    offset: const Offset(0, 1),
    spreadRadius: -0.5,
  ),
]);