.yn-private-map-v1 .yn-map-v1 {
    width: 360px;
    height: 360px;
    margin: 0 auto;
}

@media (min-width:768px) {
    .yn-private-map-v1 .yn-map-v1 {
        width: 700px;
        height: 700px;
        margin: 0 auto;
    }
}