diff --git a/assets/css/admin.scss b/assets/css/admin.scss
index 41dad08..e6af956 100644
--- a/assets/css/admin.scss
+++ b/assets/css/admin.scss
@@ -258,6 +258,13 @@ th {
     }
 }
 
+.bg-tiles {
+    background-color: #c1c1c1;
+    background-image: linear-gradient(45deg, #646464 25%, transparent 25%, transparent 75%, #646464 75%), linear-gradient(45deg, #646464 25%, transparent 25%, transparent 75%, #646464 75%);
+    background-size: 20px 20px;
+    background-position: 0 0, 10px 10px;
+}
+
 .tab-form {
     padding: 15px;
 }
diff --git a/core/Command/UserCreateCommand.php b/core/Command/UserCreateCommand.php
index 5715663..2248210 100644
--- a/core/Command/UserCreateCommand.php
+++ b/core/Command/UserCreateCommand.php
@@ -42,7 +42,13 @@ class UserCreateCommand extends Command
 
         $emailQuestion = new Question('E-mail: ');
         $emailQuestion->setValidator(function ($value) {
-            return !empty($value);
+            if (empty($value)) {
+                throw new \RuntimeException(
+                    'The email must not be empty.'
+                );
+            }
+
+            return $value;
         });
 
         $passwordQuestion = new Question('Password (leave empty to generate a random password): ');
diff --git a/core/Resources/views/form/bootstrap_4_form_theme.html.twig b/core/Resources/views/form/bootstrap_4_form_theme.html.twig
index d309a9a..8f05398 100644
--- a/core/Resources/views/form/bootstrap_4_form_theme.html.twig
+++ b/core/Resources/views/form/bootstrap_4_form_theme.html.twig
@@ -6,9 +6,9 @@
             {% set value = form.vars.data %}
 
             {% if value %}
-                {% if value and value.extension in ['jpeg', 'jpg', 'gif', 'png'] %}
+                {% if value and value.extension in ['jpeg', 'jpg', 'gif', 'png', 'svg'] %}
                     <div class="card">
-                        <div class="card-img-top bg-dark text-center">
+                        <div class="card-img-top bg-tiles text-center">
                             <a href="{{ asset(value.pathname) }}" target="_blank">
                                 <img src="{{ asset(value.pathname) }}" class="img-fluid">
                             </a>