storybook/docs/snippets/web-components/storybook-story-layout-param.ts.mdx

```ts
// Button.stories.ts

import type { Meta, StoryObj } from '@storybook/web-components';

const meta: Meta = {
  component: 'demo-button',
};

export default meta;
type Story = StoryObj;

export const WithLayout: Story = {
  parameters: {
    layout: 'centered',
  },
};
```