style.css

html,
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #000;
  color: #fff;
}

#overlay {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  background: rgba(0, 0, 0, 0.5);
  padding: 8px 12px;
  border-radius: 8px;
  max-width: 320px;
  font-size: 0.9rem;
}

#overlay h1 {
  margin: 0 0 4px 0;
  font-size: 1.1rem;
}