Override styles for auth pages

config/adminlte.php

@@ -527,6 +527,17 @@ return [
               'location' => 'https://cdn.jsdelivr.net/npm/fullcalendar@5.0.1/main.min.css'
             ]
           ]
-        ],  
+        ],
+        [
+          'name' => 'AuthCustomisations',
+          'active' => true,
+          'files' => [
+            [
+              'type' => 'css',
+              'asset' => false,
+              'location' => '/css/authpages.css'
+            ]
+          ]
+        ]
     ],
 ];

public/css/authpages.css

@@ -0,0 +1,6 @@
+/* overrides customizations for the AdminLTE auth pages */
+
+.login-page, .register-page  {
+  background-image: url('/img/authbg.jpg') !important;
+  background-size: cover !important;
+}