anychart.onDocumentReady(function () {
var chart = anychart.column();
var series = chart.column([
{x: 'January', value: 18},
{x: 'February', value: 25},
var tooltip = series.tooltip();
tooltip.background({fill: '#BDBDBD', stroke: '3 #4CAF50'});
chart.title('Get and modify tooltip object');
chart.container('container');