score:2

you can set the color for the title and subtitle like you would set any other color in highcharts :

title: {
      style: {
         color: '#ffcc00',
         font: '16px lucida grande, lucida sans unicode, verdana, arial, helvetica, sans-serif'
      }
   },
   subtitle: {
      style: {
         color: '#ffcc00',
         font: '12px lucida grande, lucida sans unicode, verdana, arial, helvetica, sans-serif'
      }
   },

fiddle


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