anychart.onDocumentReady(function () {
var chart = anychart.area();
var series = chart.stepArea([
{x: 'January', value: 125},
{x: 'February', value: 132},
{x: 'March', value: 141},
{x: 'April', value: 158},
series.fill(['#263238', '#FFFFFF'], 45, true, 0.5);
chart.title('Set fill as a linear gradient');
chart.container('container');