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

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

<Meta
  title='Stories'
  parameters={{
    viewport: {
      viewports: MINIMAL_VIEWPORTS,
      defaultViewport: 'iphone6'
    },
  }}
/>

<Story
  name="MyStory"
  parameters={{
    viewport: {
      defaultViewport: 'iphonex'
    }
  }}
>
  <div />
</Story>
```