old_contents: import createStyles from './styles';
  
  const config = {
    maxWidth: 600,
    marginLeft: 50
  };
  
  export default {
    ...config,
    styles: createStyles(config)
  };
  
new_contents: import createStyles from './styles';
  
  const config = {
    maxWidth: 600,
    margin: '0 0 0 50px'
  };
  
  export default {
    ...config,
    styles: createStyles(config)
  };
  
subject: update layout