Prestashot
shows question mark if it can't find image in given address.
Your backgroud address is:
but need to be:
http://www.exotique.bg/themes/simpleresponsivetheme/img/fon4.jpg
Relace line:
body {
background: url("/img/fon4.jpg") repeat scroll 0 0 rgba(0, 0, 0, 0);
with:
body {
background: url("../img/fon4.jpg") repeat scroll 0 0 rgba(0, 0, 0, 0);
It will try to find image in one level up, not in root.