code: function(card) {
      var bg = ['#333', '#ccc'][card.state];
      return (
        <div style={{
          width: 100, height: 50,
          lineHeight: '50px',
          margin: '0 auto',
          textAlign: 'center',
          border: '1px solid black',
          transition: 'background-color 3s',
          backgroundColor: bg,
          color: 'white'
        }}>
          {bg}
        </div>
      );
    }
docs: state-timer