CSS3 contains a few new background properties, which allow greater control of the background element.
we can add more then one image as background through css3. you can set the properties of any element like this below:
#nst{
background-image:url(atal-setu.png), url(new-nst.png);
background-position:right bottom, left top;
background-repeat:no-repeat, no-repeat;
}