/* Same as before. */
:root { --spacing: 1rem; }

body {
	font-family: sans-serif;
	padding: var(--spacing);
}

section {
	background-color: var(--background, deepskyblue);
	border-block-start: solid black calc(var(--spacing) / 5);
	padding: var(--spacing);

	&:not(:first-child) { margin-block-start: var(--spacing); }
}