title: ExtJS 4.1 - Override css of Ext.LoadMask
body: <p>I have a requirement to override the default background color of <code>Ext.LoadMask</code> from white to grey. How can I achieve this? Also adding the screenshot of the image and the code that I am using to load the mask.</p>
  
  <p><img src="https://i.stack.imgur.com/ac3oZ.png" alt="My Mask"></p>
  
  <pre><code>var feestore = this.getBillingFeePanelStoreStore();
          feestore.on({
              beforeload: this.beforeFeestoreLoad,
              scope: this
          });
  
  beforeFeestoreLoad: function(store, operation, eOpts){
      var myMask = new Ext.LoadMask(Ext.getBody(), {msg:"Please wait.... Your request is being processed"});
      myMask.show();
  </code></pre>
  
  <p>Any help is appreciated.</p>