:root {
	--card-height: 225px;
	--card-margin: 1vw;
	--card-top-offset: 2em;
	--numcards: 5;
	--outline-width: 0px;
}

#cards {
	padding: 0;
	margin: 0;
	padding-bottom: calc(var(--numcards) * var(--card-top-offset)); /* Make place at bottom, as items will slide to that position*/
	margin-bottom: var(--card-margin); /* Don't include the --card-margin in padding, as that will affect the scroll-timeline*/
}

#card_1 {
	--index: 1;
}

#card_2 {
	--index: 2;
}

#card_3 {
	--index: 3;
}

#card_4 {
	--index: 4;
}

#card_5 {
	--index: 5;
}

.card {
	position: sticky;
	top: 0;
	padding-top: calc(var(--index) * var(--card-top-offset));
}

@supports (animation-timeline: works) {

	@scroll-timeline cards-element-scrolls-in-body {
		source: selector(body);
		scroll-offsets:
			/* Start when the start edge touches the top of the scrollport */
			selector(#cards) start 1,
			/* End when the start edge touches the start of the scrollport */
			selector(#cards) start 0
		;
		start: selector(#cards) start 1; /* Start when the start edge touches the top of the scrollport */
		end: selector(#cards) start 0; /* End when the start edge touches the start of the scrollport */
		time-range: 4s;
	}

	.card {
		--index0: calc(var(--index) - 1); /* 0-based index */
		--reverse-index: calc(var(--numcards) - var(--index0)); /* reverse index */
		--reverse-index0: calc(var(--reverse-index) - 1); /* 0-based reverse index */
	}

	@keyframes scale {
		to {
			transform:
				scale(calc(
					1.1
					-
					calc(0.1 * var(--reverse-index))
				));
		}
	}
}


#cards {
	list-style: none;
	outline: calc(var(--outline-width) * 10) solid blue;
	position: relative;
	z-index: 9;
	display: grid;
	grid-template-columns: 1fr;
	grid-template-rows: repeat(var(--numcards), var(--card-height));
	gap: var(--card-margin);
}

.card {
	outline: var(--outline-width) solid hotpink;
}