title: Set opacity of Highcharts pie chart
body: <p>I have an issue with IE8, while set opacity of a pie chart. I tried as follow,</p>
  
  <pre><code>.highcharts-point {
      filter:alpha(opacity=40);
  }
  </code></pre>
  
  <p>When applied this, the pie chart points became not visible and their borders became grey color. </p>
  
  <p>Does anyone know a solution?</p>