#scan-wrap {
  position: relative; width: 100%; max-width: 520px; aspect-ratio: 16/9;
  overflow: hidden; border-radius: 12px; background: #000;
}
#scan-wrap video, #scan-wrap canvas, #scan-wrap .quagga-video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; transform-origin: center center;
}