#explainer-holder {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #000000;
  bottom: 0;
  z-index: 11;
  opacity: 0;
  transition: opacity transform 0.5s;
  opacity: 1;
}
#explainer-holder iframe {
  height: 100%;
  width: 100%;
  border: none;
}