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

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

import { Gizmo } from './Gizmo';

<Meta
  title="Gizmo"
  component={Gizmo}
  argTypes={{
    width: {
      control: { 
        type: 'range', 
        min: 400, 
        max: 1200, 
        step: 50,
      },
    },
  }}
/>
```