```md
<!-- Page.stories.mdx -->

import { Meta, Story } from '@storybook/addon-docs';

import { Page } from './Page';

<Meta title="Page" component={Page} />

<!--
 👇 Render functions are a framework specific feature to allow you control on how the component renders.
  See https://storybook.js.org/docs/7.0/react/api/csf
  to learn how to use render functions.
-->

<Story
  name="CustomFooter"
  args={{
    footer: 'Built with Storybook',
  }}
  render={(args) => (
    <Page {...args}>
      <footer>{args.footer}</footer>
    </Page>
  )} />
```