javascript - Google Chart setAction: how to change TextStyle? -

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screenshot playing around google chart (pie), , have setaction written below. code adds button on tooltip. knows how change textstyle of button? not copying format of tooltip itself.

chart.setaction({   id: 'sample',   text: 'drill down',   action: function() {     selection = chart.getselection();     switch (selection[0].row) {       case 0: alert('downdrill a'); break;       case 1: alert('downdrill b'); break;       case 2: alert('downdrill c'); break;     }   } });


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