I am working with highcharts.js and I have two questions related to making my pie charts:

How do I enlarge each of these pie charts and how do I set the two chart in the middle of the pane?

```
$(function() {
    var chart = new Highcharts.Chart({
        chart: {
            renderTo: 'container', type: 'pie'
        },
        title: {
            text: 'Pesticide Residues On Domestic and Imported Foods'
        },
        subtitle: {
            text: 'Percent of foods that exceed FDA or EPA tolerances',
        },
        plotOptions: {
            pie: {
                dataLabels: { enabled: false }
            }
        },
        series: [{
            name: 'Domestic foods',
            size: 150,
            x: 0,
            center: [100, 100],
            data: [
                ['Firefox', 44.2], ['IE7', 26.6], ['IE6', 20], ['Chrome', 3.1], ['Other', 5.4]
            ]
        }, {
            name: 'Imported foods',
            size: 150,
            center: [300, 100],
            data: [
                ['Firefox', 44.2], ['IE7', 26.6], ['IE6', 20], ['Chrome', 3.1], ['Other', 5.4]
            ]
        }]
    });
});

```

[jsfiddle](http://jsfiddle.net/sc2n1L7v/3/)