text: import React, { PropTypes } from 'react';
  
  export default class HistoryHeader extends React.Component {
  
    static propTypes = {
      children: PropTypes.element
    }
  
    render() {
      const headerStyle = {
        borderBottom: '1px solid #e7ecf1'
      };
  
      return (
        <div style={ headerStyle }>
          { this.props.children }
        </div>
      );
    }
  }
  