I have a loadmask that works great!

startMask = new Ext.LoadMask(Ext.getBody(), {
     msg: '<div>A bunch of dynamic data goes here</div>',
     msgCls: 'fake',
     removeMask: true


I can not seem to change the background of the loadmask. I have tried applying a class to the msgCls and to the internal div I have in the msg. Can any one help pull my head out on this one?