body {
  background: #1c1817;
}

iframe {
  position: absolute;
  inset: 0 0;
}

.uc-header {
  opacity: 0;
  visibility: hidden;
  transition: opacity .6s, visibility .6s;
  position: relative;
  display: none;
  z-index: 1;
}

.visible {
  opacity: 1;
  visibility: visible;
}

.block {
  display: block;
}