put flashed messages under header

templates/base.html

@@ -3,11 +3,14 @@
 
 {% block title %}Prolefeeder{% endblock %}
 {% block content %}
+<div class="container">
 
+<div class="page-header">
+{% block page_header %}{% endblock %}
+</div>
 {{ utils.flashed_messages() }}
 
-<div class="container">
 {% block app_content %}{% endblock %}
-</div>
 
+</div>
 {% endblock %}

templates/download.html

@@ -10,11 +10,11 @@
     <link href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.47/css/bootstrap-datetimepicker.min.css" rel="stylesheet">
 {% endblock %}
 
-{% block app_content %}
-    <div class="page-header">
-        <h1>Download</h1>
-    </div>
+{% block page_header %}
+    <h1>Download</h1>
+{% endblock %}
 
+{% block app_content %}
     <div class="row">
         <div class='col-sm-6'>
             {{ wtf.quick_form(form, button_map={'submit': 'primary'}) }}