Highcharts - Compare two months (DOW histogram)

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 400px; height: 400px; margin: 0 auto"></div>

JavaScript

$(function() {
  $('#container').highcharts({
    chart: {
     type: 'line',
    },
    title: {
      text: 'Monthly Compare'
    },

    xAxis: [{
      categories: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
      dateTimeLabelFormats: {
        day: '%e of %b (%w)'
      },

      title: {
        text: 'Feb/Mar 2016',
        style: {
          color: Highcharts.getOptions().colors[0]
        }
      }

    }],
    yAxis: [{ // Primary yAxis
      labels: {
        style: {
          color: Highcharts.getOptions().colors[2]
        }
      },
      title: {
        text: 'Sales',
        style: {
          color: Highcharts.getOptions().colors[2]
        }
      }

    }],
    tooltip: {
      shared: true
    },
    legend: {
      layout: 'vertical',
      align: 'left',
      x: 100,
      verticalAlign: 'top',
      y: 25,
      floating: true,
      backgroundColor: (Highcharts.theme && Highcharts.theme.legendBackgroundColor) || '#FFFFFF'
    },
    series: [ {
      name: 'Feb Sales',
      type: 'column',
      color: "#E0FFE0",
      data: [10, 10, 11, 12, 9, 24, 25],

      dashStyle: 'shortdot',
      tooltip: {
        valuePrefix: '£'
      }

    },{
      name: 'March Sales',
      type: 'column',
      color: "#80FF80",
      data: [11, 10, 13, 14,10, 26, 25.5],
      tooltip: {
        valuePrefix: '£'
      }

    }]
  });

});