diff --git a/core/modules/forum/templates/forum-icon.html.twig b/core/modules/forum/templates/forum-icon.html.twig
index b32b734..80d3b93 100644
--- a/core/modules/forum/templates/forum-icon.html.twig
+++ b/core/modules/forum/templates/forum-icon.html.twig
@@ -18,15 +18,9 @@
  * @ingroup themeable
  */
 #}
-{%
-  set classes = [
-    'icon',
-    'topic-status-' ~ icon_status,
-  ]
-%}
-<div{{ attributes.addClass(classes) }}>
+<div>
   {% if first_new -%}
-    <a id="new"></a>
+    <a></a>
   {%- endif %}
-  <span class="visually-hidden">{{ icon_title }}</span>
+  <span>{{ icon_title }}</span>
 </div>
diff --git a/core/modules/forum/templates/forum-list.html.twig b/core/modules/forum/templates/forum-list.html.twig
index 5b41f6a..c68d06b 100644
--- a/core/modules/forum/templates/forum-list.html.twig
+++ b/core/modules/forum/templates/forum-list.html.twig
@@ -32,7 +32,7 @@
  * @ingroup themeable
  */
 #}
-<table id="forum-{{ forum_id }}">
+<table>
   <thead>
     <tr>
       <th>{{ 'Forum'|t }}</th>
@@ -43,37 +43,35 @@
   </thead>
   <tbody>
   {% for child_id, forum in forums %}
-    <tr id="forum-list-{{ child_id }}" class="{{ forum.zebra }}">
+    <tr>
       <td {% if forum.is_container == true -%}
-        colspan="4" class="container"
-      {%- else -%}
-        class="forum"
+        colspan="4"
       {%- endif -%}>
         {#
           Enclose the contents of this cell with X divs, where X is the
           depth this forum resides at. This will allow us to use CSS
           left-margin for indenting.
         #}
-        {% for i in 1..forum.depth if forum.depth > 0 %}<div class="indent">{% endfor %}
-          <div class="icon forum-status-{{ forum.icon_class }}" title="{{ forum.icon_title }}">
-            <span class="visually-hidden">{{ forum.icon_title }}</span>
+        {% for i in 1..forum.depth if forum.depth > 0 %}<div>{% endfor %}
+          <div title="{{ forum.icon_title }}">
+            <span>{{ forum.icon_title }}</span>
           </div>
-          <div class="name"><a href="{{ forum.link }}">{{ forum.label }}</a></div>
+          <div><a href="{{ forum.link }}">{{ forum.label }}</a></div>
           {% if forum.description.value %}
-            <div class="description">{{ forum.description.value }}</div>
+            <div>{{ forum.description.value }}</div>
           {% endif %}
         {% for i in 1..forum.depth if forum.depth > 0 %}</div>{% endfor %}
       </td>
       {% if forum.is_container == false %}
-        <td class="topics">
+        <td>
           {{ forum.num_topics }}
           {% if forum.new_topics == true %}
             <br />
             <a href="{{ forum.new_url }}">{{ forum.new_text }}</a>
           {% endif %}
         </td>
-        <td class="posts">{{ forum.num_posts }}</td>
-        <td class="last-reply">{{ forum.last_reply }}</td>
+        <td>{{ forum.num_posts }}</td>
+        <td>{{ forum.last_reply }}</td>
       {% endif %}
     </tr>
   {% endfor %}
diff --git a/core/modules/forum/templates/forum-submitted.html.twig b/core/modules/forum/templates/forum-submitted.html.twig
index f679363..c0d7cd0 100644
--- a/core/modules/forum/templates/forum-submitted.html.twig
+++ b/core/modules/forum/templates/forum-submitted.html.twig
@@ -17,7 +17,7 @@
  */
 #}
 {% if time %}
-  <span class="submitted">{% trans %}By {{ author|passthrough }} {{ time }} ago{% endtrans %}</span>
+  <span>{% trans %}By {{ author|passthrough }} {{ time }} ago{% endtrans %}</span>
 {% else %}
   {{ 'n/a'|t }}
 {% endif %}
diff --git a/core/modules/forum/templates/forums.html.twig b/core/modules/forum/templates/forums.html.twig
index 1bb7c05..ca40e32 100644
--- a/core/modules/forum/templates/forums.html.twig
+++ b/core/modules/forum/templates/forums.html.twig
@@ -17,7 +17,7 @@
  */
 #}
 {% if forums_defined %}
-  <div id="forum">
+  <div>
     {{ forums }}
     {{ topics }}
     {{ topics_pager }}
diff --git a/core/modules/forum/templates/forum-icon.html.twig b/core/themes/classy/forum/forum-icon.html.twig
similarity index 100%
copy from core/modules/forum/templates/forum-icon.html.twig
copy to core/themes/classy/forum/forum-icon.html.twig
diff --git a/core/modules/forum/templates/forum-list.html.twig b/core/themes/classy/forum/forum-list.html.twig
similarity index 100%
copy from core/modules/forum/templates/forum-list.html.twig
copy to core/themes/classy/forum/forum-list.html.twig
diff --git a/core/modules/forum/templates/forum-submitted.html.twig b/core/themes/classy/forum/forum-submitted.html.twig
similarity index 100%
copy from core/modules/forum/templates/forum-submitted.html.twig
copy to core/themes/classy/forum/forum-submitted.html.twig
diff --git a/core/modules/forum/templates/forums.html.twig b/core/themes/classy/forum/forums.html.twig
similarity index 100%
copy from core/modules/forum/templates/forums.html.twig
copy to core/themes/classy/forum/forums.html.twig