#page-transition{position:fixed;inset:0;background:var(--color-accent);z-index:var(--z-transition);transform:scaleY(0);transform-origin:bottom}
#page-transition.run{animation:curtain .76s var(--ease-in-out)}
@keyframes curtain{0%{transform:scaleY(0);transform-origin:bottom}45%{transform:scaleY(1);transform-origin:bottom}55%{transform:scaleY(1);transform-origin:top}100%{transform:scaleY(0);transform-origin:top}}