.header .cont .head { background:url(https://khasfile.ir/wp-content/themes/gilfile-wp/img/head.jpg); }
@media screen and (max-width:768px){
.header .cont .head { background-image:url(https://khasfile.ir/wp-content/themes/daneshfile_55354/img/head-res.jpg);
}
@media screen and (max-width:768px){
.header .cont .head { background-image:url(https://khasfile.ir/wp-content/themes/gilfile-wp/img/head-res.jpg);
}