html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: sans-serif;
  background: #111;
  color: #eee;
}

#viewer-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 50px;
  overflow: hidden;
}

#viewer {
  width: 100%;
  height: 100%;
}

#controls {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: #000;
  border-top: 1px solid #333;
}

button {
  background: #333;
  color: #eee;
  border: none;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}

button:hover {
  background: #555;
}