labelBorderThickness: Number

Sets the thickness of border around the axisY Label in pixels. To display border around Label, set the labelBorderThickness to a number greater than zero.

• Label border thickness works when border color is applied.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisY: {
      labelBorderColor: "#FF7F7F",
      labelBorderThickness: 2
 },
 .
 . 
});
chart.render();