nextcloud/apps/accessibility/css/themedark.scss

// SCSS variables
$color-main-text: #d8d8d8;
$color-main-background: #181818;

$color-background-dark: lighten($color-main-background, 4%);
$color-background-darker: lighten($color-main-background, 8%);

$color-text-maxcontrast: darken($color-main-text, 30%);
$color-text-light: darken($color-main-text, 10%);
$color-text-lighter: darken($color-main-text, 20%);

$color-loading-light: #777;
$color-loading-dark: #ccc;

$color-box-shadow: rgba(darken($color-main-background, 70%), 0.5);

$color-border: lighten($color-main-background, 7%);
$color-border-dark: lighten($color-main-background, 14%);

#app-navigation > ul > li > a:first-child,
#app-navigation > ul > li > ul > li > a:first-child,
#expanddiv a {
	img {
		filter: invert(100%);
	}
}
.bubble,
.app-navigation-entry-menu,
.popovermenu {
	li {
		> button,
		> a,
		> .menuitem {
			> img {
				filter: invert(100%);
			}
		}
	}
}
.bubble,
.app-navigation-entry-menu,
.popovermenu,
#header .menu {
	border: 1px solid var(--color-border);
}

// since svg icons are inverted, revert to white for the header
.header-right > * {
	[class^='icon-'], [class*=' icon-'] {
		filter: invert(100%);
	}
}