.wp-block-gmap-gmap-block {
    iframe {
        width: 100%;
        height: 400px;
        box-sizing: border-box;
        border: none;
    }

    // tablet view
    @media (min-width: 768px) and (max-width: 1024px) {
        iframe {
            height: 300px;
        }
    }

    // mobile view
    @media (max-width: 767px) {
        iframe {
            height: 200px;
        }
    }
}