Highcharts: problem centering pie chart in portrait orientation

Hi guys,

I’m using highcharts framework (ng-highchart directive), when I display a pie chart in portrait mode it isn’t centered into the page but right-shifted, while in landscape mode it is right displayed!

My view:

<ion-view view-title="Home">
        <div class="row">
            <div class=".col">
                <highchart config="chartConfig"></highchart>

My controller:

.controller('HomeCtrl', function ($scope) {

    $scope.energyChartConfig = {
        chart: {
            type: 'pie'
        series: [{
            data: [10, 15, 12, 8, 7],
            id: 'series1'
        title: {
            text: 'Hello'

How can I make the chart responsive at device orientation? Any hint?