i need to set a full page background image to a custom report.

i'm using the next html structure inside of a web.basic_layout:

div class header

​ ​div style = position: absolute; top: 0; left: 0;

​ ​​​img for a logo 

div class footer

​ ​div  style = position: absolute; bottom: 0; right: 0;

​ ​ ​​img for another logo

div class page

​​stuff like tables