Remove duplicate HTML ID

Resources/public/css/screen.css

@@ -171,7 +171,7 @@ table tbody tr td {
   font-size: 0.9em;
 }
 
-#section {
+.section {
   border: 1px solid #ddd;
   background: #f8f8f8;
   padding: 5px 20px;

Resources/views/resources.html.twig

@@ -3,7 +3,7 @@
 {% block content %}
     {% for section, sections in resources  %}
         {% if section != '_others' %}
-            <li id="section">
+            <li class="section">
                 <h1>{{ section }}</h1>
                 <ul>
         {% endif %}