TDCountDown _buildCustomUnitSmallSize(BuildContext context) {
  var style = TDCountDownStyle.generateStyle(context, size: TDCountDownSize.small);
  style.timeColor = TDTheme.of(context).errorColor6;
  return TDCountDown(
    time: 60 * 60 * 1000,
    splitWithUnit: true,
    style: style,
  );
}