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

import { html } from 'lit-html';

import './demo-button';

//👇 We create a “template” of how args map to rendering
const Template = ({ background, label }) =>
  html`<demo-button .background=${background} .label=${label}></demo-button>`;

//👇 Each story then reuses that template
export const Primary = Template.bind({});
Primary.args = { background: '#ff0', label: 'Button' };

export const Secondary = Template.bind({});
Secondary.args = { ...Primary.args, label: '😄👍😍💯' };

export const Tertiary = Template.bind({});
Tertiary.args = { ...Primary.args, label: '📚📕📈🤓' };
```