#zoom {
  overflow: clip;
}

#zoom span {
  display: inline-block;

  animation: zoom-zoom ease-out both;
  animation-range: 0 55%;
  animation-timeline: view();

  z-index: 2;  /* over #timber */
}

@keyframes zoom-zoom {
  from { scale: 400; }
  to { scale: 1; }
}