Separating theme from layout for CSS files.

Change-Id: I4c3cec28b30de8026df4298f65ebf6ad92faf68f
(cherry picked from commit 11f662f)
diff --git a/web/gui/src/main/webapp/app/fw/layer/panel.css b/web/gui/src/main/webapp/app/fw/layer/panel.css
index ce68b45..6f0232d 100644
--- a/web/gui/src/main/webapp/app/fw/layer/panel.css
+++ b/web/gui/src/main/webapp/app/fw/layer/panel.css
@@ -15,7 +15,7 @@
  */
 
 /*
- ONOS GUI -- Panel Service -- CSS file
+ ONOS GUI -- Panel Service (layout) -- CSS file
  */
 
 .floatpanel {
@@ -41,14 +41,3 @@
 html[data-platform='iPad'] .floatpanel {
     top: 80px;
 }
-
-.light .floatpanel {
-    background-color: rgba(255,255,255,0.8);
-    color: black;
-    box-shadow: 0 2px 12px #777;
-}
-.dark .floatpanel {
-    background-color: rgba(50,50,50,0.8);
-    color: #ccc;
-    box-shadow: 0 2px 12px #000;
-}