labelFontColor: String

Sets the color of label (text) shown in Range Buttons. The value of labelFontColor can be a “HTML Color Name”, “hex code” or “rgba values”

Default: “grey”
Example: “red”, “#FAC003”, … 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 rangeSelector: {
   buttonStyle: {
     labelFontColor: "#FAC003",
     .
     .
    }
 },
 .
 . 
});
stockChart.render();
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