iframe {
  border: none;
  margin: 0 auto;
  position:absolute;
  left: 0;
  width: 800px;
  right: 0;
  top: 0;
  height: 1200px;
}

@media all and (max-width: 801px) {
  iframe {
    width: 100%;
    transform-origin: top left;
    transform: scale(0.9);
  }

  @media all and (max-width: 700px) {
    iframe {
      width: 700px;
      transform: scale(0.7);
    }
  }

  @media all and (max-width: 600px) {
    iframe {
      width: 600px;
      transform: scale(0.45);
    }
  }
}