flutter listTile add bottom border

ListView.separated( //<-- SEE HERE
  itemCount: items.length,
  itemBuilder: (context, index) {
    return ListTile(
      leading: CircleAvatar(
        backgroundColor: const Color(0xff6ae792),
        child: Text(
          items[index],
          style: TextStyle(color: Colors.black),
        ),
      ),
      title: Text(
        'Item ${items[index]}',
      ),
      subtitle: Text('Item description'),
      trailing: Icon(Icons.more_vert),
    );
  },
  separatorBuilder: (context, index) {//<-- SEE HERE
    return Divider(
      thickness: 2,
    );
  },
)