```js
// Button.stories.js

import Button from './Button.svelte';
import MarginDecorator from './MarginDecorator.svelte';

export default {
  /* 👇 The title prop is optional.
   * See https://storybook.js.org/docs/7.0/svelte/configure/overview#configure-story-loading
   * to learn how to generate automatic titles
   */
  title: 'Button',
  component: Button,
};

/*
 *👇 Render functions are a framework specific feature to allow you control on how the component renders.
 * See https://storybook.js.org/docs/7.0/svelte/api/csf
 * to learn how to use render functions.
 */
export const Primary = {
  render: () => ({
    component: Button,
  }),
  decorators: [() => MarginDecorator],
};
```