Flutter: tough_bikes, button container styling

main.dart

/// In BikeList.build > Column.children
Container(
  decoration: BoxDecoration(
    boxShadow: const [
      BoxShadow(spreadRadius: 0.0, blurRadius: 20.0),
    ],
    color: Colors.grey.shade800,
  ),
  child: Row(
    children: <Widget>[
      Expanded(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: BikeButton(),
        ),
      )
    ],
  ),
)