text: import React from 'react';
  
  const Header = (props) => (
      <div className="header">
          <div className="container">
              <h1 className="header__title">{props.title}</h1>
              {props.subtitle && <h2 className="header__subtitle">{props.subtitle}</h2>}
          </div>
      </div> 
  );
  
  Header.defaultProps = {
      title: 'Trackmob - Frontend Test'
  };
  
  export default Header;