open-props/css/z-index.css

<div align="center">

:where(:root) {
	--layer-1: 1;
	--layer-2: 2;
	--layer-3: 3;
	--layer-4: 4;
	--layer-5: 5;
	--layer-bottom: var(--layer-1);
	--layer-top: var(--layer-5);
	--layer-important: 2147483647;
}