Fix invalid css

Change-Id: I816117c779652c68a6d5fffb0fe10a802bea691c
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css b/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
index 2aa93f4..8033c50 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
@@ -1362,3 +1362,4 @@
 .addMemberTextBox {
   margin-right: 2px;
   margin-bottom: 2px;
+}