/* The host draws nothing of its own: the inner frame fills the host's
   viewport, and the app sizes the host from the `height` messages. */
html,
body,
#frame-root {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: transparent;
}

iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}