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

canvas {
  display: block;
}

.cam-source {
  position: fixed !important;
  left: -9999px !important;
  top: -9999px !important;
  width: 16px !important;
  height: 16px !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.back,
.note {
  position: fixed;
  left: 20px;
  z-index: 10;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.42);
  text-decoration: none;
}

.back {
  top: 18px;
}

.back:hover {
  color: rgba(255, 255, 255, 0.85);
}

.note {
  bottom: 16px;
  font-size: 10px;
  letter-spacing: 0.08em;
  pointer-events: none;
}

.back:focus-visible {
  outline: 1px solid rgba(255, 255, 255, 0.6);
  outline-offset: 4px;
}