ant-design/docs/react/demo/modify-theme-token.tsx

import React from 'react';
import { Button, ConfigProvider, Space } from 'antd';

const App: React.FC = () => (
  <ConfigProvider
    theme={{
      token: {
        // Seed Token, affects wide range
        colorPrimary: '#00b96b',
        borderRadius: 2,

        // Derived token, affects narrow range
        colorBgContainer: '#f6ffed',
      },
    }}
  >
    <Space>
      <Button type="primary">Primary</Button>
      <Button>Default</Button>
    </Space>
  </ConfigProvider>
);

export default App;