@media (max-width: 499px){
 .mxt-effect a img.img-thumb {
     max-width: 100% !important;
     height: auto !important;
 }
#category .mxt-effect > div{height: 100% !important;}
}
@media (max-width: 768px){
 .mxt-effect a img.img-thumb {
     max-width: 100% !important;
     height: auto !important;
 }
#category .mxt-effect > div{height: 100% !important;}
}