.googlemaps-custom {
    height: 500px;
    width: 100%;
}

@media screen and (max-width: 767px) {
    .googlemaps-custom {
        height: 300px;
    }
}

html div.googlemaps-custom * {
    margin: 0;
    padding: 0;
    border: 0;
    outline: none;
    box-shadow: none;
}