title: Extjs Message Box Center Align
body: <p>As the title says, I would like the message of Ext.Msg.alert() to in center align. I tried this:</p>
  
  <pre><code> Ext.Msg.alert({
          title: 'Success',
          msg: 'Deleted',
          buttons: Ext.Msg.OK,
          baseCls: 'msgbox'
      });
  </code></pre>
  
  <p>CSS:</p>
  
  <pre><code> .msgbox {
        text-align: center;
    }
  </code></pre>
  
  <p>It is still on left align. How do I do this?</p>