```md
<!-- Button.stories.mdx -->

import { Meta, Story } from '@storybook/addon-docs';

import { Button } from './Button';

<Meta 
  title="Accessibility testing" 
  component={Button} 
  argTypes={{
    backgroundColor: {
      control: {
        type: 'color',
      }
    }
  }} />

export const Template = (args) => <Button {...args} />;

## This is an accessible story

<Story
  name="Accessible"
  args={{ 
    primary: false,
    label: 'Button'
  }}>
  {Template.bind({})}
</Story>

## This is not

<Story
  name="Inaccessible"
  args={{
    primary: false, 
    label: 'Button',
    backgroundColor: 'red'
  }}>
  {Template.bind({})}
</Story>
```