ONOS-4359: continued work on theming UI (app control buttons).

Change-Id: I87c510caee499a2ecaa51241785e300cb06c1f61
(cherry picked from commit a705605)
diff --git a/web/gui/src/main/webapp/app/view/app/app.css b/web/gui/src/main/webapp/app/view/app/app.css
index 5d53794..5d83914 100644
--- a/web/gui/src/main/webapp/app/view/app/app.css
+++ b/web/gui/src/main/webapp/app/view/app/app.css
@@ -23,7 +23,7 @@
 }
 
 #ov-app div.ctrl-btns {
-    width: 290px;
+    width: 260px;
 }
 
 #ov-app form#inputFileForm,