Template:Breadcrumb2/styles.css

/* Breadcrumb navigation style */
.breadcrumb {
	display: inline-block;
	margin-left: 0.7em;
	margin-bottom: 0.3em;
	padding: 0.2em 0.4em;
	border-top: 1px solid #C0C0C0;
	border-bottom: 1px solid #C0C0C0;
}

.breadcrumb ol {
	margin: 0;
	padding: 0;
	line-height: inherit;
	list-style: none;
}

.breadcrumb li {
	display: inline-block;
	margin: 0;
	white-space: nowrap;
}

.breadcrumb li + li {
	padding-left: 1.1em;
	background: no-repeat top -4px left 4px/12px url("https://upload.wikimedia.org/wikipedia/commons/d/df/Breadcrumb_separator.svg");
}

html.skin-theme-clientpref-night .breadcrumb li + li {
	padding-left: 1.1em;
	background: no-repeat top -4px left 4px/12px url("https://upload.wikimedia.org/wikipedia/commons/5/5c/Breadcrumb_separator_%28dark_mode_version%29.svg");
}

@media screen and (prefers-color-scheme: dark) {
	/* automatic mode */
	html.skin-theme-clientpref-os .breadcrumb li + li {
		padding-left: 1.1em;
		background: no-repeat top -4px left 4px/12px url("https://upload.wikimedia.org/wikipedia/commons/5/5c/Breadcrumb_separator_%28dark_mode_version%29.svg");
	}
}