Widget _buildBottomNavBar() {
    return Container(
      height: 67,
      margin: EdgeInsets.symmetric(horizontal: 10, vertical: 30),
      child: Card(
        margin: EdgeInsets.zero,
        shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.all(Radius.circular(17))),
        elevation: 10,
        child: Container(
          decoration: BoxDecoration(
              gradient: theme.gradient,
              borderRadius: BorderRadius.all(Radius.circular(17))),
          child: BottomNavigationBar(
            elevation: 0,
            type: BottomNavigationBarType.fixed,
            backgroundColor: Colors.transparent,
            selectedItemColor: theme.maincolor,
            currentIndex: _selectedTab,
            iconSize: 26,
            selectedLabelStyle: TextStyle(color: Colors.white),
            onTap: _onItemTapped,
            items: <BottomNavigationBarItem>[
              _buildNavItem(OMIcons.book, Icons.book),
              _buildNavItem(OMIcons.flag, Icons.flag),
              _buildNavItem(OMIcons.event, Icons.event),
              _buildNavItem(
                  OMIcons.supervisedUserCircle, Icons.supervised_user_circle),
              _buildNavItem(OMIcons.trendingUp, Icons.trending_up),
            ],
          ),
        ),
      ),
    );
  }