Hello Shoji,
First of all I would like to inform you that the data-style="inset" in iOS7 application has been removed, as the items are all inset by default, so the property is not needed if you are using iOS 7 platform. As for the ListView styling - I am not exactly sure which exact background color you would like to change, but please check the following example, and let me know if it helps:
http://jsbin.com/gemit/1/edit
Regards,
Kiril Nikolov
Telerik
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