backgroundColor: String

Sets the background color of Range Buttons. Values of backgroundColor can be specified in “HTML Color Name”, “hex code” or “rgba values”

Default: “white”
Example: “blue”, “#a0beec”, … 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 rangeSelector: {
   buttonStyle: {
     backgroundColor: "#eccaa0",
     .
     .
   },
 },
 .
 . 
});
stockChart.render();
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