:root {
	--color-page:       #e0e0e0;
	--color-text:       black;
	--color-link:       blue;
	--color-link-seen:  darkblue;
	--color-line:       black;
}
@media screen and (prefers-color-scheme: dark) {
    :root {
	--color-page:       #303030;
	--color-text:       #e0e0e0;
	--color-link:       #90d0e0;
	--color-link-seen:  #90d0ff;
	--color-line:       #808080;
    }
}

body {
	background: var(--color-page);
	color: var(--color-text);
}
h1 {
	border-bottom: 1px solid var(--color-line);
}
p {
	max-width: 90ex;
}
a {
	color: var(--color-link);
	text-decoration: underline;
}
a:visited {
	color: var(--color-link-seen);
}