html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  font-family: Arial, sans-serif;
}

#reader {
  width: 100vw;
  height: 100vh;
}

#reader video {
  width: 100vw !important;
  height: 100vh !important;
  object-fit: cover !important;
}

#backButton {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 9999;
  padding: 10px 14px;
  border: none;
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.65);
  color: white;
  font-size: 16px;
  cursor: pointer;
}

#result {
  position: fixed;
  bottom: 20px;
  left: 10px;
  right: 10px;
  color: white;
  background: rgba(0,0,0,0.7);
  padding: 12px;
  border-radius: 8px;
  text-align: center;
  z-index: 9999;
  display: none;
}