```js
// demo-button.stories.js

import { html } from 'lit-html';

import './demo-button';

export default {
  title: 'Button',
  //👇 Creates specific parameters for the story
  parameters: {
    backgrounds: {
      values: [
        { name: 'red', value: '#f00' },
        { name: 'green', value: '#0f0' },
        { name: 'blue', value: '#00f' },
      ],
    },
  },
};
```