diff --git a/theme/boost/templates/maintenance.mustache b/theme/boost/templates/maintenance.mustache
index 39fcaaf919b..a24aae048cf 100644
--- a/theme/boost/templates/maintenance.mustache
+++ b/theme/boost/templates/maintenance.mustache
@@ -13,7 +13,7 @@
 
     {{{ output.standard_top_of_body_html }}}
 
-    <div id="page" class="container card">
+    <div id="page" class="container card card-block">
 
         <div class="row">
             <div class="col-xs-12 p-y-1">