html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var chart = anychart.cartesian();

​

    var series = chart.rangeArea([

        {x: 'January', low: 2, high: 3},

        {x: 'February', low: 3, high: 6},

        {x: 'March', low: 2, high: 4}

    ]);

​

    // Set low stroke.

    series.lowStroke(function () {

        return anychart.color.setThickness(anychart.color.darken(this.sourceColor), 3);

    });

​

    chart.title('Set low stroke as a function');

    chart.container('container');

    chart.draw();

});