diff --git a/web/gui2-fw-lib/projects/gui2-fw-lib/src/lib/util/theme.service.ts b/web/gui2-fw-lib/projects/gui2-fw-lib/src/lib/util/theme.service.ts
new file mode 100644
index 0000000..993d9f3
--- /dev/null
+++ b/web/gui2-fw-lib/projects/gui2-fw-lib/src/lib/util/theme.service.ts
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { Injectable } from '@angular/core';
+import { LogService } from '../log.service';
+
+
+/**
+ * ONOS GUI -- Util -- Theme Service
+ */
+@Injectable({
+  providedIn: 'root',
+})
+export class ThemeService {
+    themes: string[] = ['light', 'dark'];
+    thidx = 0;
+
+    constructor(
+        private log: LogService
+    ) {
+        this.log.debug('ThemeService constructed');
+    }
+
+    getTheme(): string {
+        return this.themes[this.thidx];
+    }
+
+    themeStr(): string {
+        return this.themes.join(' ');
+    }
+
+}