ant-design/components/layout/demo/fixed.md

order	iframe	title
6	360	[{zh-CN 固定头部} {en-US Fixed Header}]

zh-CN

一般用于固定顶部导航，方便页面切换。

en-US

Fixed Header is generally used to fix the top navigation to facilitate page switching.

import { Breadcrumb, Layout, Menu } from 'antd';
import React from 'react';

const { Header, Content, Footer } = Layout;

const App: React.FC = () => (
  <Layout>
    <Header style={{ position: 'fixed', zIndex: 1, width: '100%' }}>
      <div className="logo" />
      <Menu
        theme="dark"
        mode="horizontal"
        defaultSelectedKeys={['2']}
        items={new Array(3).fill(null).map((_, index) => ({
          key: String(index + 1),
          label: `nav ${index + 1}`,
        }))}
      />
    </Header>
    <Content className="site-layout" style={{ padding: '0 50px', marginTop: 64 }}>
      <Breadcrumb style={{ margin: '16px 0' }}>
        <Breadcrumb.Item>Home</Breadcrumb.Item>
        <Breadcrumb.Item>List</Breadcrumb.Item>
        <Breadcrumb.Item>App</Breadcrumb.Item>
      </Breadcrumb>
      <div className="site-layout-background" style={{ padding: 24, minHeight: 380 }}>
        Content
      </div>
    </Content>
    <Footer style={{ textAlign: 'center' }}>Ant Design ©2018 Created by Ant UED</Footer>
  </Layout>
);

export default App;

#components-layout-demo-fixed .logo {
  float: left;
  width: 120px;
  height: 31px;
  margin: 16px 24px 16px 0;
  background: rgba(255, 255, 255, 0.2);
}
.site-layout .site-layout-background {
  background: #fff;
}