Storybook: Decorate all stories of a component

// Button.stories.ts|tsx

import React from 'react';

import { ComponentMeta } from '@storybook/react';

import { Button } from './Button';

export default {
  /* 👇 The title prop is optional.
  * See https://storybook.js.org/docs/react/configure/overview#configure-story-loading
  * to learn how to generate automatic titles
  */
  title: 'Button',
  component: Button,
  decorators: [
    (Story) => (
      <div style={{ margin: '3em' }}>
        <Story />
      </div>
    ),
  ],
} as ComponentMeta<typeof Button>;