.scene { position: relative; }
.scene > .scene-stage { position: relative; }
html.js .scene.is-live { height: calc((var(--hold, 2) + 1) * 100svh); }
html.js .scene.is-live > .scene-stage {
  position: sticky;
  top: 0;
  height: 100svh;
  overflow: clip;       
  contain: layout paint;
}
.scene.is-live [data-move] { will-change: transform, opacity; }
html.is-smooth { scroll-behavior: auto; }
html.is-smooth body { overscroll-behavior: none; }
@media (prefers-reduced-motion: reduce) {
  html.js .scene.is-live { height: auto; }
  html.js .scene.is-live > .scene-stage { position: relative; height: auto; }
}