Add css for room preview bar.

src/skins/vector/css/matrix-react-sdk/views/rooms/RoomPreviewBar.css

@@ -0,0 +1,32 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+
+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.
+*/
+
+.mx_RoomPreviewBar {
+    text-align: center;
+}
+
+.mx_RoomPreviewBar_preview_text {
+    color: #a4a4a4;
+}
+
+.mx_RoomPreviewBar_join_text {
+    color: #ff0064;
+}
+
+.mx_RoomPreviewBar_join_text a {
+    text-decoration: underline;
+    cursor: pointer;
+}