html,
body {
  margin: 0;
  height: 100%;
  background: #cec8eb;
}
#stage {
  position: relative;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
}
iframe {
  position: absolute;
  top: 0;
  left: 50%;
  border: 0;
  transform-origin: top center;
}