buttonBorderColor: String

Sets the border color of buttons (zoom/pan, reset & export-menu) in toolbar. Values of buttonBorderColor can be specified in “HTML Color Name”, “hex code” or “rgba values”.

• Border will not be added if there is only one button in the toolbar.

var chart= new CanvasJS.Chart("container",
{
 .
 .
 toolbar: {
     buttonBorderColor: "#eccaa0",
     .
     .
 },
 .
 . 
});
chart.render();