html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: transparent;
}

#wrap {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

#wrap.hidden {
  display: none;
}

#mdt {
  width: 100%;
  height: 100%;
  border: 0;
}