old_contents: // @flow
  
  import React from 'react';
  import PropTypes from 'prop-types';
  import { withStyles, createStyleSheet } from 'material-ui/styles';
  import Button from 'material-ui/Button';
  
  // We can inject some CSS into the DOM.
  const styleSheet = createStyleSheet('OverridesClassNames', {
    bouton: {
      background: 'linear-gradient(45deg, #FE6B8B 30%, #FF8E53 90%)',
      borderRadius: 3,
      border: 0,
      color: 'white',
      height: 48,
      padding: '0 30px',
      boxShadow: '0 3px 5px 2px rgba(255, 105, 135, .30)',
    },
  });
  
  function OverridesClassNames(props) {
    return (
      <Button className={props.classes.bouton}>
        {props.children ? props.children : 'class names'}
      </Button>
    );
  }
  
  OverridesClassNames.propTypes = {
    children: PropTypes.node,
    classes: PropTypes.object.isRequired,
  };
  
  export default withStyles(styleSheet)(OverridesClassNames);
  
new_contents: // @flow
  
  import React from 'react';
  import PropTypes from 'prop-types';
  import { withStyles, createStyleSheet } from 'material-ui/styles';
  import Button from 'material-ui/Button';
  
  // We can inject some CSS into the DOM.
  const styleSheet = createStyleSheet('OverridesClassNames', {
    button: {
      background: 'linear-gradient(45deg, #FE6B8B 30%, #FF8E53 90%)',
      borderRadius: 3,
      border: 0,
      color: 'white',
      height: 48,
      padding: '0 30px',
      boxShadow: '0 3px 5px 2px rgba(255, 105, 135, .30)',
    },
  });
  
  function OverridesClassNames(props) {
    return (
      <Button className={props.classes.button}>
        {props.children ? props.children : 'class names'}
      </Button>
    );
  }
  
  OverridesClassNames.propTypes = {
    children: PropTypes.node,
    classes: PropTypes.object.isRequired,
  };
  
  export default withStyles(styleSheet)(OverridesClassNames);
  
subject: Fix typo in class name (#7192)