GUI -- Implemented Panel Service.

Change-Id: I5e60c6ffa5676bc11f7312681af7bca85b4f8036
diff --git a/web/gui/src/main/webapp/app/fw/layer/panel.css b/web/gui/src/main/webapp/app/fw/layer/panel.css
new file mode 100644
index 0000000..f83d595
--- /dev/null
+++ b/web/gui/src/main/webapp/app/fw/layer/panel.css
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2014,2015 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 -- Panel Service -- CSS file
+ */
+
+.floatpanel {
+    position: absolute;
+    z-index: 100;
+    display: block;
+    top: 64px;
+    width: 200px;
+    right: -220px;
+    opacity: 0;
+    background-color: rgba(255,255,255,0.8);
+
+    padding: 10px;
+    color: black;
+    font-size: 10pt;
+
+    -moz-border-radius: 6px;
+    border-radius: 6px;
+    box-shadow: 0px 2px 12px #777;
+}
+
+/* TODO: light/dark themes */
+.light .floatpanel {
+
+}
+.dark .floatpanel {
+
+}