Long qudrant label highcharts

by prakhar230792

HTML

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

<div id="container" style="min-width: 500px;"></div>

JavaScript

Highcharts.chart('container', {
  chart: {
    type: 'scatter',
    plotBackgroundColor: '#C8E4f7'
  },
  title: {
    text: 'Average annual total return',
    align: 'left',
    style: {
      fontSize: '14px'
    }
  },
  credits: {
    enabled: false
  },
  legend: {
    enabled: false
  },
  xAxis: {
    min: 9,
    max: 21,
    gridLineWidth: 0,
    tickWidth: 0,
    lineWidth: 0,
    tickPositions: [9, 11, 13, 15, 17, 19, 21],
    title: {
      text: 'Volatility (%)'
    },
    plotLines: [{
      color: '#FFFFFF',
      width: 1,
      value: 15
    }, {
      color: '#FFFFFF',
      width: 0,
      value: 9,
      zIndex: 5,
      label: {
        text: 'Lower return, lower volatility',
        rotation: 0,
        verticalAlign: 'bottom',
        x: 10,
        y: -10,
        style: {
          fontWeight: 'bold'
        }
      }
    }, {
      color: '#FFFFFF',
      width: 0,
      value: 9,
      zIndex: 5,
      label: {
        text: 'Higher return, lower volatility',
        rotation: 0,
        verticalAlign: 'top',
        x: 10,
        y: 15,
        style: {
          fontWeight: 'bold'
        }
      }
    }, {
      color: '#FFFFFF',
      width: 0,
      value: 21,
      zIndex: 5,
      label: {
        align: 'right',
        text: 'Higher return, lower volatility',
        rotation: 0,
        verticalAlign: 'bottom',
        x: -10,
        y: -10,
        style: {
          fontWeight: 'bold'
        }
      }
    }, {
      color: '#FFFFFF',
      width: 0,
      value: 21,
      zIndex: 5,
      label: {
        align: 'right',
        text: 'Higher return, higher volatility - A very ver very very very very very very very long label',
        rotation: 0,
        verticalAlign: 'top',
        x: -10,
        y: 15,
        style: {
          fontWeight: 'bold'
        }
      }
    }]
  },
  yAxis: {
    min: 0,
    max: 12,
    gridLineWidth: 0,
    tickInterval: 2,
    title: {
      text: ''
    },
    plotLines: [{
     ...