text: import React, { Component } from 'react'
  import PropTypes from 'prop-types'
  import NotFound from '../../../NotFound'
  
  const styles = {
    container: {
      flexGrow: 1
    }
  }
  
  class SubrouteB extends Component {
    static propTypes = {
      match: PropTypes.object.isRequired
    }
  
    render () {
      const { isExact } = this.props.match
      if (isExact) {
        return (
          <div style={styles.container}>
            <div className='column-container'>
              <h3>Page B</h3>
            </div>
          </div>
        )
      } else {
        return <NotFound />
      }
    }
  }
  
  export default SubrouteB
  