Q:

Changing HighCharts background color?

I don't really know how to do this.
I need to change background color of this highcharts chart:
http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/demo/polar-spider/
But I don't seem to be able to do so - there doesn't seem to be any clear place to put the background color setting? 
I've tried to write many different values in this section:
chart: {
        polar: true,
        type: 'line'
},

But it didn't do anything ( it occasionally broke this script ).
Do I need to change it somewhere in the included .js files? Or can it be done from the level of this loaded script?
JS is really confusing. Can anyone help me?

A:

Take a look at the Highcharts API here: https://api.highcharts.com/highcharts/chart.backgroundColor and you will see it's a property of the chart object that can take a solid color:
{
  chart: {
     backgroundColor: '#FCFFC5',
     polar: true,
     type: 'line'
  }
}

Or Gradiant:
{
  chart: {
    backgroundColor: {
       linearGradient: [0, 0, 500, 500],
       stops: [
         [0, 'rgb(255, 255, 255)'],
         [1, 'rgb(200, 200, 255)']
       ]
     },
     polar: true,
     type: 'line'
  }
}

