CSS - 将所有内容标记在body标签中

I am trying to center everything within the tag on the page without adding another container within it. My situation doesn't allow me to change the markup that is being generated but I am able to edit the CSS. My overall objective is to create css that allows me to use the zoom tag in IE for the print css (to zoom out), but the way it is currently working, this creates a lot of white space on the right side and I'd like to make sure the content is always centered in the middle.I am trying to center everything within the tag