[Solved]-how remove picture frame for Highchart chart pie-Highcharts

highcharts.chart('container', {
      chart: {
         renderto: 'container',
         plotbackgroundcolor: null,
         plotborderwidth: null,
         plotshadow: null
      },
      title: {
         text: 'ideas por estado',
         align: 'center',
         style:
         {
             color: '#000000',
            fontweight: 'bold'
         }
      },
      credits: {
      	enabled: false
  		},   
      legend: {    
        align: 'center',
        verticalalign: 'bottom',
        layout: 'vertical',
        itemstyle: {
            color: '#000000',
            fontsize: 12
        },
        x: 0,
        y: -50

      },
      plotoptions: {
         pie: {
            allowpointselect: true,
            cursor: 'pointer',
            size: '80%',
            center: [ '50%', '45%' ],
            datalabels: {
               enabled: true,
               distance: -35,
               color: '#ffffff',
               style: {
                   fontweight: 'bold',
                   fontsize: 13
               },
               formatter: function() {
                  if(this.point.color=='#fd4c01'){
                      return '<span>' + this.y +' %</span>';
                  }
                  if(this.point.color=='#77c646'){
                      return '<span>' + this.y +' %</span>';
                  }
                  if(this.point.color=='#01a698'){
                      return '<span>' + this.y +' %</span>';
                  }
                  
               }
            },
            showinlegend: true
         },
      },
      series: [{
         type: 'pie',
         data: [
            {
                name: 'company a',
                 y: 59.2,
                color: '#01a698'
            },
            {
                name: 'company b',
                 y: 30.4,
                color: '#77c646'
            },
            {
                name: 'company c',
                 y: 10.4,
                color: '#fd4c01'
            }
         ]
      }],
      tooltip : {enabled : false }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<div id="container"></div>