Template:Note/style.css

.skin-theme-clientpref-night .box-note {
	color: #fff !important;
	background-color: #261c09 !important;
	border-color: #6a481c !important;
}

@media (prefers-color-scheme: dark) {
	.skin-theme-clientpref-os .box-note {
		color: #fff !important;
		background-color: #261c09 !important;
		border-color: #6a481c !important;
	}
}