- Настроили положение окна

common/modules/school/assets/js/school.js

@@ -150,6 +150,11 @@ $(document).ready(function() {
         type: 'inline',
         preloader: false
     });
+
+    $(document).on('click', '.mfp-close', function (e) {
+        e.preventDefault();
+        $.magnificPopup.close();
+    });
 }); 
  
 // pre-submit callback 

common/modules/school/views/course/index.php

@@ -92,7 +92,7 @@ WidgetAssetBundle::register($this);
     </div>
 </section>
 
-<div class="white-popup-block mfp-hide mfp-close-btn-in get-code-window">
+<div class="white-popup-block mfp-hide">
     <?= RegistrationWidget::widget(); ?>
 </div>