text: import Header from './header';
  import PropTypes from 'prop-types';
  
  const layoutStyle = {
    margin: 20,
    padding: 20,
    border: '1px solid #DDD'
  };
  
  const Layout = props => (
    <div style={layoutStyle}>
      <Header />
      {props.children}
    </div>
  );
  
  Layout.propTypes = {
    children: PropTypes.node.isRequired
  };
  
  export default Layout;
  