borderThickness: Number

Sets the border thickness of Range Buttons in pixels.

To display border, set the borderThickness to a number greater than zero. Setting it to zero will remove the border.

Default: 1
Example: 2, 4, … 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 rangeSelector: {
   buttonStyle: {
     borderThickness: 2,
     .
     .
   }
 },
 .
 . 
});
stockChart.render();
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