Replaced the well element with the card (bootstrap).

assets/js/general_functions.js

@@ -316,9 +316,14 @@ window.GeneralFunctions = window.GeneralFunctions || {};
         GeneralFunctions.displayMessageBox(EALang.unexpected_issues, EALang.unexpected_issues_message);
 
         $('<div/>', {
-            'class': 'well',
+            'class': 'card',
+            'html': [
+                $('<div/>', {
+                    'class': 'card-body',
                     'html': response.message || '→ No error information provided.'
                 })
+            ]
+        })
             .appendTo('#message_box');
     };