:root {
	--base-unit: 4px;
	--base-font-size: calc(var(--base-unit) * 6);
}

html {
	font-family: Times, "Times New Roman", serif;
}

body {
	max-width: 70ch;
	margin-inline: auto;
	font-size: var(--base-font-size);
	line-height: 3ex;
}

h1 {
	font-size: 200%;
}

button {
	font-size: 80%;
	padding: 1ex;
}

.center {
	text-align: center;
}

.full-width {
	width: 100%;
}