If you want make the footer display at the very bottom for short content pages, you can use the code below. Paste this in the Divi Options/Ingergration area in the header section.

<script>
jQuery(function($){
function stickyFooter(){
var footer = $("#main-footer");
var position = footer.position();
var height = $(window).height();
height = height - position.top;
height = height - footer.outerHeight();
if (height > 0) {
footer.css({'margin-top' : height+'px'});
}
}
stickyFooter();
$(window).resize(function(){
stickyFooter();
});
});
</script>