diff --git a/web/gui/src/main/webapp/app/view/topoX/topoX-theme.css b/web/gui/src/main/webapp/app/view/topoX/topoX-theme.css
new file mode 100644
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+++ b/web/gui/src/main/webapp/app/view/topoX/topoX-theme.css
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+
+/*
+ ONOS GUI -- Topology View (theme) -- CSS file
+ */
+
+/* --- Base SVG Layer --- */
+
+#ov-topoX svg {
+    /*background-color: #f4f4f4;*/
+    background-color: goldenrod; /* just for testing */
+}
+
+/* --- "No Devices" Layer --- */
+
+#ov-topoX svg .noDevsBird {
+    fill: #db7773;
+}
+
+#ov-topoX svg #topoX-noDevsLayer text {
+    fill: #7e9aa8;
+}
+
+/* --- Topo Map --- */
+
+#ov-topoX svg #topoX-map {
+    stroke-width: 2px;
+    stroke: #f4f4f4;
+    fill: #e5e5e6;
+}
+