如何从Outlook 2010/2013中的html电子邮件模板的回复中删除背景颜色

I have created an html file that I converted into a outlook template file. My template has a solid blue background color that is defined by setting the bgcolor attribute on the body tag. When I send this to users everything is great until they reply using Outlook 2010 or 2013. When they reply the blue background color is present in their response. How can I write my css to only fill the background on the initial email, not the reply?I have created an html file that I converted in