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showModalBottomSheet(
    context: context,
    isScrollControlled: true,
    builder: (BuildContext context) {
      return FractionallySizedBox(
        heightFactor: 0.7,
        child: Container(
          padding: EdgeInsets.all(16.0),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.vertical(
              top: Radius.circular(16.0),
            ),
          ),
          child: Column(
            children: [
              Container(
                width: 40,
                height: 4,
                margin: EdgeInsets.only(bottom: 16.0),
                decoration: BoxDecoration(
                  color: Colors.grey,
                  borderRadius: BorderRadius.circular(2),
                ),
              ),
              Expanded(
                child: Center(
                  child: Text(
                    'This is a BottomSheet with a height of 70% of the screen.',
                    style: TextStyle(fontSize: 16),
                    textAlign: TextAlign.center,
                  ),
                ),
              ),
            ],
          ),
        ),
      );
    },
  );