Fix CSS typo.

Change-Id: Ice6f913e8d05d6139dc5a31fbca6107b0981f3c5
diff --git a/src/main/site/css/main.css b/src/main/site/css/main.css
index ab0d0a0..f1a04b6 100644
--- a/src/main/site/css/main.css
+++ b/src/main/site/css/main.css
@@ -229,7 +229,7 @@
 
 #gwt-footer {
   clear: both;
-  padding-top: 20px 0;
+  padding: 10px 0;
   background-color: #d5f0f6;
   border-bottom: 10px solid #606060;
   position: absolute;