add (experimental) night.css

themes/night.css

+@import "default.css";
+
+#feeds-holder {
+	background : #222;
+  	border-color : #666;
+}
+
+body#ttrssMain #feedTree .dijitTreeRow {
+	color : #ccc;
+}
+
+body#ttrssMain.claro .dijitTree .dijitTreeRowHover {
+	background : #444;
+	border-color : #666;
+}
+
+body#ttrssMain.claro .dijitTree .dijitTreeRowSelected {
+	background : #555;
+	border-color : #666;
+}
+
+body#ttrssMain.claro .dijitTreeRowSelected .dijitTreeLabel {
+	text-shadow : none;
+}
+
+body#ttrssMain #feedTree .counterNode.aux {
+	background : #555;
+	color : #999;
+	border-color : #333;
+}
+
+body#ttrssMain #feedTree .counterNode {
+	border : 1px solid #6280AD;
+	color : white;
+	background : #6280AD;
+}
+
+body#ttrssMain #headlines-frame {
+	background : #333;
+	color : white;
+}
+
+body#ttrssMain #main-toolbar {
+	background : #333;
+	border-color : #666;
+}
+
+body#ttrssMain #main-toolbar .dijitButtonText {
+	color : #ddd;
+}
+
+body#ttrssMain #main-toolbar .dijitSelect {
+	border-color : #666;
+}
+
+
+body#ttrssMain #main,
+body#ttrssMain #overlay {
+	background : #333;
+	color : white;
+}
+
+body#ttrssMain .hlFeed a {
+	color : white;
+}
+
+body#ttrssMain div.cdm.expanded div.cdmFooter,
+body#ttrssMain div.cdm.expandable div.cdmFooter {
+	border-color : #666;
+	color : #ccc;
+}
+
+body#ttrssMain div.cdm.expandable.Selected {
+	background : #6280AD;
+}
+
+body#ttrssMain div.cdm.expanded.Unread div.cdmHeader a.title,
+body#ttrssMain div.cdm.expandable.Unread a.title {
+	color : #ccc;
+}
+
+body#ttrssMain div.cdm.expanded div.cdmHeader a.title,
+body#ttrssMain div.cdm.expandable a.title {
+	color : #aaa;
+}
+
+body#ttrssMain .cdm.expandable.active,
+body#ttrssMain .cdm.expandable {
+	border-color : #666;
+	background : transparent;
+}
+
+body#ttrssMain .cdm.active {
+	background : transparent ! important;
+}
+
+body#ttrssMain .cdm .cdmContentInner,
+body#ttrssMain .cdm .titleWrap {
+	color : #bbb;
+}
+
+#content-insert blockquote, #headlines-frame blockquote, .dijitContentPane blockquote {
+	color : #999;
+	border-color : #666;
+}
+
+#content-insert code, #headlines-frame code, .dijitContentPane code {
+	color : #009900;
+}
+
+#content-insert pre, #headlines-frame pre, .dijitContentPane pre {
+	color : #999;
+	background : black;
+}
+
+body#ttrssMain .dijitInputField.dijitButtonText {
+	background : #333;
+}
+
+body#ttrssMain .cdm .cdmContentInner img,
+body#ttrssMain .cdm img.tinyFeedIcon,
+body#ttrssMain .cdm .cdmFooter img,
+body#ttrssMain #feedTree img {
+	filter: grayscale(1);
+	-webkit-filter: grayscale(1);
+}
+
+body#ttrssMain .cdm .cdmFooter img {
+	opacity : 0.6;
+}
+
+body#ttrssMain #floatingTitle {
+	background : #333;
+	border-color : #666;
+}
+
+body#ttrssMain #floatingTitle a.title {
+	color : #ccc;
+}
+
+body#ttrssMain .dijitMenu,
+body#ttrssMain .dijitMenuTable,
+body#ttrssMain .dijitSelectMenu .dijitMenuItem td {
+	border-color : #666;
+	background : #666;
+}
+
+body#ttrssMain .dijitMenu .dijitMenuItem.dijitHover,
+body#ttrssMain .dijitMenu .dijitMenuItem.dijitFocused,
+body#ttrssMain .dijitMenuTable .dijitMenuItem.dijitHover .dijitMenuItemLabel,
+body#ttrssMain .dijitMenuTable .dijitMenuItem.dijitFocused .dijitMenuItemLabel {
+	background : black;
+	color : white;
+}
+