diff --git a/WebContent/main.css b/WebContent/main.css
index efe027180..4346f1b75 100644
--- a/WebContent/main.css
+++ b/WebContent/main.css
@@ -433,6 +433,7 @@ html, body {
 .mapping-checkbox
 {
 	margin: 0px 5px 3px 5px;
+	padding: 0px;
 }
 .mapping-button
 {