如何在sencha touch中修改placeHolder的颜色

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例子：

index.jsExt.setup({onReady: function() {new Ext.form.FormPanel({fullscreen: true,items: [{xtype: 'textfield',label: 'Name',cls: 'customField',placeHolder: 'Insert your name here'},{xtype: 'textfield',label: 'Surname',placeHolder: 'Insert your surname here'}]});}});

style.css.customField input::-webkit-input-placeholder {color: #2e4bc5;}