ant-design/components/card/demo/inner.tsx

import React from 'react';
import { Card } from 'antd';

const App: React.FC = () => (
  <Card title="Card title">
    <Card type="inner" title="Inner Card title" extra={<a href="#">More</a>}>
      Inner Card content
    </Card>
    <Card
      style={{ marginTop: 16 }}
      type="inner"
      title="Inner Card title"
      extra={<a href="#">More</a>}
    >
      Inner Card content
    </Card>
  </Card>
);

export default App;