.m-contact-form__map {
  width: 100%;
  overflow: hidden;
}

.m-contact-form__map iframe {
  display: block;
  width: 100%;
  height: 450px;
  max-width: 100%;
  border: 0;
}

@media screen and (max-width: 767px) {
  .m-contact-form__map iframe {
    height: 350px;
  }
}