```js
// Checkbox.stories.js

import React from 'react';
import { Checkbox } from './Checkbox';

export default { 
    title: "MDX/Checkbox",
    component: Checkbox 
};

export const allCheckboxes = () => (
  <form>
    <Checkbox id="Unchecked" label="Unchecked" />
    <Checkbox id="Checked" label="Checked" checked />
    <Checkbox appearance="secondary" id="second" label="Secondary" checked />
  </form>
);
```