@media (max-width: 991px) {
    .container {
        background: #fff url(https://img.7ya.ru/ny2018/mobile_snow_bgr.jpg) 50% -62px no-repeat !important;
    }
}
@media (min-width: 768px) {
    .visible-sm .nav.mainmenu_conf>li>a>img {
        max-width: 185px;
        height: auto;
    }
}