diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88935af..283e34b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- Fix alert overflow on large login screens.
+
 ## [1.13.0] - 2025-09-22
 
 ### Added
diff --git a/inc/alert.class.php b/inc/alert.class.php
index 084e14c..60d11b6 100644
--- a/inc/alert.class.php
+++ b/inc/alert.class.php
@@ -602,8 +602,9 @@ public static function getSizeClasses(string $size): string
     public static function displayAlert($alert, $p)
     {
         $twig = TemplateRenderer::getInstance();
+        $size = $p['show_only_login_alerts'] ? 'col-12' : self::getSizeClasses($alert['size']);
         $twig->display('@news/display_alert.html.twig', [
-            'size'                   => self::getSizeClasses($alert['size']),
+            'size'                   => $size,
             'alert_fields'           => $alert,
             'content'                => $alert['message'],
             'can_close'              => $alert['is_close_allowed'] && !$p['show_hidden_alerts'],