如何更改bottomNavigationBar的颜色？

BottomNavigationBar(
  items: const <BottomNavigationBarItem>[
    BottomNavigationBarItem(
      icon: Icon(Icons.home),
      label: 'Home',
    ),
    BottomNavigationBarItem(
      icon: Icon(Icons.business),
      label: 'Business',
    ),
    BottomNavigationBarItem(
      icon: Icon(Icons.school),
      label: 'School',
    ),
  ],
  selectedItemColor: Colors.blue, // 设置选中项颜色为蓝色
  unselectedItemColor: Colors.grey, // 设置未选中项颜色为灰色
),

import { Menu } from 'antd';

<Menu mode="horizontal" theme="dark" selectedKeys={['home']}>
  <Menu.Item key="home" className="custom-menu-item">Home</Menu.Item>
  <Menu.Item key="business" className="custom-menu-item">Business</Menu.Item>
  <Menu.Item key="school" className="custom-menu-item">School</Menu.Item>
</Menu>

.custom-menu-item {
  color: blue; /* 设置底部导航栏的颜色为蓝色 */
}