diff --git a/course/yui/modchooser/modchooser.js b/course/yui/modchooser/modchooser.js
index 919110212c1..5d95a025a85 100644
--- a/course/yui/modchooser/modchooser.js
+++ b/course/yui/modchooser/modchooser.js
@@ -27,6 +27,7 @@ YUI.add('moodle-course-modchooser', function(Y) {
                 width: '540px'
             };
             this.setup_chooser_dialogue(dialogue, header, params);
+            this.overlay.get('boundingBox').addClass('modchooser');
 
             this.jumplink = this.container.one('#jump');
 
diff --git a/theme/base/style/core.css b/theme/base/style/core.css
index 16cbae93b9a..ceb387d10c2 100644
--- a/theme/base/style/core.css
+++ b/theme/base/style/core.css
@@ -920,6 +920,10 @@ sup {vertical-align: super;}
     display:none;
 }
 
+.modchooser .moodle-dialogue-hd {
+    text-align: center;
+}
+
 /* Center the submit buttons within the area */
 #choosercontainer #chooseform .submitbuttons {
     margin: 0.7em 0;