body iframe[src^="https://site.saby.ru"],
body .consultant-widget-Window {
   width: 100% !important;
   max-width: 768px !important;
   min-width: 384px !important;
   margin: 0 auto !important;
   box-sizing: border-box !important;
}
@media (max-width: 768px) {
   body iframe[src^="https://site.saby.ru"],
   body .consultant-widget-Window {
      max-width: 100% !important;
      margin: 0 !important;
   }
}