Add style to status_code page

bvplan/templates/bvplan.html

@@ -16,7 +16,7 @@
 
         <script src="/static/js/bvplan.js"></script>
         <script>
-            setTimeout(reload, waitDelay);
+            setTimeout(reload, 30_000);
         </script>
     </body>
 {% endblock %}

bvplan/templates/status_code.html

@@ -2,7 +2,13 @@
 
 {% block title %}{{ status_code.as_str() }}{% endblock %}
 
-{% block head %}{% endblock %}
+{% block head %}
+    <style>
+        html, body {
+            text-align: center;
+        }
+    </style>
+{% endblock %}
 
 {% block body %}
     <h1>{{ status_code }}</h1>