I got this custom report (model sale.order) and i have added an the svg that is fixed to the upper right corner and an image that is fixed to the lower left corner (using header and footer), but there's still a space on all the sides. The paperformat linked already has all the margins set to 0.

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

div class header

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

​ ​svg 

div class footer

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

​ ​img

div class page

​stuff like tables