html.background-pending,
html.yt-boot,
html.background-pending body,
html.yt-boot body {
  background: #000 !important;
}

html.background-pending .wallpaper-stage,
html.yt-boot .wallpaper-stage {
  opacity: 0 !important;
}

html.yt-boot .youtube-background,
html.yt-boot .youtube-background.is-active {
  opacity: 0 !important;
  visibility: hidden !important;
}

html.yt-boot.yt-revealed .youtube-background.is-active {
  opacity: 1 !important;
  visibility: visible !important;
  transition: opacity .8s ease !important;
}