html, body { block-size: 100%; }

body {
	--base: 1rem;

	display: grid;
	font-family: sans-serif;
	padding: var(--base);
	place-content: center;
	place-items: center;
	row-gap: var(--base);
}

button {
	background-color: deepskyblue;
	border-radius: calc(var(--base) / 2);
	cursor: pointer; /* Show the Mickey-Mouse hand! */
	padding: calc(var(--base) / 2);
}