diff --git a/src/Products/PageTemplates/www/ptAdd.zpt b/src/Products/PageTemplates/www/ptAdd.zpt
index 439f6d56fe..26c13268e3 100644
--- a/src/Products/PageTemplates/www/ptAdd.zpt
+++ b/src/Products/PageTemplates/www/ptAdd.zpt
@@ -1,6 +1,6 @@
 <h1 tal:replace="structure here/manage_page_header">Header</h1>
 
-<main>
+<main class="container-fluid">
 
 <h2 tal:define="form_title string:Add Page Template"
     tal:replace="structure here/manage_form_title">Form Title</h2>
diff --git a/src/Products/PageTemplates/www/ptEdit.zpt b/src/Products/PageTemplates/www/ptEdit.zpt
index a9183bda42..5d818c5358 100644
--- a/src/Products/PageTemplates/www/ptEdit.zpt
+++ b/src/Products/PageTemplates/www/ptEdit.zpt
@@ -2,7 +2,7 @@
 <h2 tal:define="manage_tabs_message options/manage_tabs_message | nothing"
     tal:replace="structure context/manage_tabs">Tabs</h2>
 
-<main>
+<main class="container-fluid">
 
 <tal:block define="global body request/other/text | request/form/text
                                                   | context/read" />