title: Override Antd's selected Item color
body: <p>I want to override the <code>background-color</code> property of the <code>ant-menu-item-selected</code> class. By default it appears blue.</p>
  
  <pre><code>import { Menu } from 'antd';
  const { Item } = Menu;
  
  //item2 will be rendered with the class 'ant-menu-item-selected'
  const MyComp = () =&gt; (
    &lt;Menu theme="dark" defaultSelectedKeys={["item2"]} mode="horizontal"&gt;
      &lt;Item key="item1"&gt;Item 1&lt;/Item&gt;
      &lt;Item key="item2"&gt;Item 2&lt;/Item&gt;
    &lt;/Menu&gt;
  );
  
  ReactDOM.render(&lt;MyComp /&gt;,document.getElementById('root'));
  </code></pre>
  
  <p>How should I do?</p>
  
  <p>Thank you for your help.</p>