html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #111923;
}

.reveal {
  width: 100%;
  height: 100%;
}

#loading {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: #111923;
  color: #dfe7ee;
  font: 1rem/1.5 "Segoe UI", Arial, sans-serif;
  text-align: center;
}

#loading.player-error {
  color: #ffb4b4;
  white-space: pre-wrap;
}

#print-button {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 90;
  padding: 0.5rem 0.75rem;
  color: #dfe7ee;
  background: #172438dd;
  border: 1px solid #62758a;
  border-radius: 0.35rem;
  cursor: pointer;
}

@media print {
  #print-button { display: none; }
}