body
This is top-level element represents entire text of the document of an eBook source file. To specify margins, apply CSS style properties within this tag.
While you can set font colors using the text attribute, you cannot modify the background color for the body text. Neither the bgcolor attribute of the <body> tag nor the CSS property background-color are currently supported in Reader.

attributes

id
Provides an element with a unique name within a single document. This is especially useful in works with extensive cross-referencing and linking, such as dictionaries, encyclopedias, or travel guides. Use of ids  simplifies linking and updates.
class
Affiliates an element with one or more classes.
style
Attaches a list of inline (name:value paired) CSS properties to a specific tag, for example: style="name:value;name:value"
Note: Media types other than "text/x-oeb1-css" will be ignored with a warning in a document of type "text/x-oeb1-document".
title
This attribute is ignored.
bgcolor
This attribute is ignored.
text
Text font color.