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

import { Button } from './demo-button';

export default {
  /* 👇 The title prop is optional.
   * See https://storybook.js.org/docs/7.0/web-components/configure/overview#configure-story-loading
   * to learn how to generate automatic titles
   */
  title: 'Button',
  //👇 Creates specific argTypes
  argTypes: {
    backgroundColor: { control: 'color' },
  },
  args: {
    //👇 Now all Button stories will be primary.
    primary: true,
  },
};

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