diff --git a/templates/default/html/variable_form.twig b/templates/default/html/variable_form.twig
index 40e6644c..9f17ffb8 100644
--- a/templates/default/html/variable_form.twig
+++ b/templates/default/html/variable_form.twig
@@ -1,4 +1,4 @@
-<form class="form-horizontal" role="form" method="get" id="variable_form">
+<form class="form-horizontal well well-sm" role="form" method="get" id="variable_form">
 	<input type='hidden' name='report' value='{{report}}' />
 
     <div class="row">