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

#bg-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

#bg-tint {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 1;
}