outlineColor: String

Sets the outline color of Slider. Values of outlineColor can be specified in “HTML Color Name”, “Hex code” or “rgb values”

Default: “#666666”
Examples: “#dedede”, “grey”, … 
var  stockChart =  new  CanvasJS.StockChart("container",
{
 .
 .
 navigator: {
   .
   .
   slider: {
     outlineColor: "#dedede",
   },
   .
   .
 },
 .
 .
});
stockChart.render();
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