html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #f4f1e8;
  cursor: crosshair;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 10;
}

#overlay span {
  font-family: 'Courier New', monospace;
  font-size: 14px;
  color: #1a1a1a;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
  transition: opacity 0.4s;
}

#overlay.hidden span {
  opacity: 0;
}