html,
body {
  margin: 0;
  padding: 0;
  border: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #000;
}

iframe {
  display: block;
  border: 0;
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
}