.uncode-bg-trail {
  position: absolute;
  pointer-events: none;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: var(--bgm-index);
}
.uncode-bg-trail .trail-img {
  overflow: hidden;
  aspect-ratio: var(--bgm-ratio);
  border-radius: var(--bgm-radius);
  position: absolute;
  top: 0;
  left: 0;
  height: auto;
  pointer-events: none;
  will-change: transform, opacity;
  transform: translate(-9999px, -9999px);
  object-fit: cover;
  opacity: 0;
  user-select: none;
}