.birgit-source[hidden] {
  display: none;
}

.birgit-source {
  position: absolute;
  inset: 0;
  background: #f7ecd7;
  animation: birgit-source-reveal 2s ease-in-out both;
}

@keyframes birgit-source-reveal {
  from { opacity: 0; }
  to { opacity: 1; }
}