storybook/addons/info/src/components/markdown/pre/copyButton.js

import React from 'react';
import PropTypes from 'prop-types';
import glamorous, { withTheme } from 'glamorous';

const Button = glamorous.button(
  {
    outline: 'none',
    overflow: 'hidden',
    border: '1px solid #eee',
    borderRadius: 3,
    backgroundColor: '#FFFFFF',
    cursor: 'pointer',
    fontSize: 13,
    padding: '3px 10px',
    alignSelf: 'flex-start',

    ':hover': {
      backgroundColor: '#f4f7fa',
      borderColor: '#ddd',
    },

    ':active': {
      backgroundColor: '#e9ecef',
      borderColor: '#ccc',
    },
  },
  props => props.styles
);

const ContentWrapper = glamorous.div(
  {
    transition: 'transform .2s ease',
    height: 16,
  },
  props => ({
    ...props.styles,
    transform: props.toggled ? 'translateY(0px)' : 'translateY(-100%) translateY(-6px)',
  })
);

function CopyButton(props) {
  const {
    copyButton: { toggleText = 'Copied!', text = 'Copy', ...copyButtonStyles } = {},
    copyButtonContent,
  } = props.theme;

  return (
    <Button onClick={props.onClick} styles={copyButtonStyles}>
      <ContentWrapper styles={copyButtonContent} toggled={props.toggled}>
        <div style={{ marginBottom: 6 }}>{toggleText}</div>
        <div>{text}</div>
      </ContentWrapper>
    </Button>
  );
}

CopyButton.propTypes = {
  onClick: PropTypes.func,
  toggled: PropTypes.bool,
  theme: PropTypes.shape({
    copyButton: PropTypes.object,
  }),
};

CopyButton.defaultProps = {
  onClick: () => {},
  toggled: false,
  theme: {},
};

export default withTheme(CopyButton);