title: How to change the button color in bootbox.alert
body: <p>I am using <code>bootbox.alert</code>. Here i am getting <code>OK</code> button with blue color. </p>
  
  <p>I want the <code>OK</code> button with orange color. I tried so many ways. Can you please suggest me.</p>
  
  <p>This is my code.</p>
  
  <pre><code>bootbox.alert({
       message : "Error in task",
       closeButton: false,
       button : {
          ok : {
            label : "OK",
            className : "btn-orange",
            callback: function () {
  
            }
         }
       }
  });
  </code></pre>