Template:Letterhead start/styles.css

/* {{pp-template}} */
.letterhead {
	background-image: url('//upload.wikimedia.org/wikipedia/commons/b/b1/Page-corner-background-color-neutral-subtle.png');
	background-repeat: no-repeat;
	padding: 2em;
	background-color: var(--background-color-neutral-subtle, #f8f9fa);
}

html.skin-theme-clientpref-night .letterhead {
	background-image: url('//upload.wikimedia.org/wikipedia/commons/a/a6/Page-corner-background-color-neutral-subtle-dark.png');
}

@media screen and (prefers-color-scheme: dark)  {
	html.skin-theme-clientpref-os .letterhead {
		background-image: url('//upload.wikimedia.org/wikipedia/commons/a/a6/Page-corner-background-color-neutral-subtle-dark.png');
	}
}