whata/assets/sass/shortcode/_contact.scss

/*--------------------------------------------------------------
26. Contact
----------------------------------------------------------------*/
.cs_location_map {
  iframe {
    height: 100%;
    min-height: 800px;
    width: 100%;
    border: none;
    filter: grayscale(100%);
    display: block;
    @media (max-width: 991px) {
      min-height: 400px;
    }
  }
}