@media screen and (max-width:450px) {
  
    #divCenter {
        height:100% !important;
        width:100% !important;
    }
}

@media screen and (max-width:780px) {

    #divCenter {
        height: 100% !important;
        width: 100% !important;
    }
}


@media screen and (max-width:990px) {

    #divCenter {
        height: 100% !important;
        width: 100% !important;
    }
}