backgroundColor: String

Sets the background color of toolTip. Values can be “HTML Color Name” or “hex” code.

Default: white
Example: “red”, “#FF0000” .. 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 toolTip:{
  backgroundColor: "#f4d5a6",
 },
 .
 .
});
chart.render();
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