Index: themes/seven/style.css
===================================================================
RCS file: /cvs/drupal/drupal/themes/seven/style.css,v
retrieving revision 1.38
diff -u -r1.38 style.css
--- themes/seven/style.css	22 Dec 2009 19:45:00 -0000	1.38
+++ themes/seven/style.css	2 Jan 2010 20:02:54 -0000
@@ -823,6 +823,7 @@
   padding-right: 20px;
 }
 body.in-maintenance #page {
+  overflow: auto;
   width: 770px;
   margin: 0 auto;
   padding-top: 2em;
Index: modules/overlay/overlay.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/overlay/overlay.module,v
retrieving revision 1.4
diff -u -r1.4 overlay.module
--- modules/overlay/overlay.module	14 Dec 2009 16:36:56 -0000	1.4
+++ modules/overlay/overlay.module	2 Jan 2010 20:02:54 -0000
@@ -259,6 +259,18 @@
 }
 
 /**
+ * Preprocess template variables for maintenance-page.tpl.php.
+ *
+ * If the current page request is inside the overlay, add appropriate classes
+ * to the <body> element, and simplify the page title.
+ *
+ * @see overlay_preprocess_maintenance_page()
+ */
+function overlay_preprocess_maintenance_page(&$variables) {
+  overlay_preprocess_html($variables);
+}
+
+/**
  * Preprocess template variables for page.tpl.php.
  *
  * Display breadcrumbs correctly inside the overlay.
