#divMag {
    margin:auto;
   height:780px;
    width:680px;
    padding:0 !important;
 
}



@media only screen and (max-width: 850px), only screen and (max-device-width: 850px) {
  
    #divMag{
    margin:auto;
  width:100%;
    min-width:320px;
     height:60vh;
    margin-top: 10px;
}
}