diff --git a/app/templates/community/add_post.html b/app/templates/community/add_post.html
index b550cd53..c26c277b 100644
--- a/app/templates/community/add_post.html
+++ b/app/templates/community/add_post.html
@@ -97,7 +97,7 @@
         </form>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card mt-3">
             <div class="card-header">
                  <h2>{{ community.title }}</h2>
@@ -121,6 +121,6 @@
             </div>
         </div>
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 {% endblock %}
\ No newline at end of file
diff --git a/app/templates/community/community.html b/app/templates/community/community.html
index d391d27e..c0847da5 100644
--- a/app/templates/community/community.html
+++ b/app/templates/community/community.html
@@ -96,7 +96,7 @@
         </nav>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card">
             <div class="card-body">
                 <div class="row">
@@ -180,7 +180,7 @@
         </div>
         {% endif %}
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 <div class="row">
 
diff --git a/app/templates/domain/domain.html b/app/templates/domain/domain.html
index fde7296a..7951bce7 100644
--- a/app/templates/domain/domain.html
+++ b/app/templates/domain/domain.html
@@ -21,9 +21,9 @@
         </div>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
 
-    </div>
+    </aside>
 </div>
 <div class="row">
 
diff --git a/app/templates/domain/domains.html b/app/templates/domain/domains.html
index 17ed936a..d8e11c00 100644
--- a/app/templates/domain/domains.html
+++ b/app/templates/domain/domains.html
@@ -22,9 +22,9 @@
         </div>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
 
-    </div>
+    </aside>
 </div>
 <div class="row">
 
diff --git a/app/templates/donate.html b/app/templates/donate.html
index 965ac66d..946c9880 100644
--- a/app/templates/donate.html
+++ b/app/templates/donate.html
@@ -16,7 +16,7 @@
         <p>Liberapay is preferred as it has lower fees.</p>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card mt-3">
             <div class="card-header">
                  <h2>{{ _('About %(site_name)s', site_name=g.site.name) }}</h2>
@@ -29,6 +29,6 @@
                 </p>
             </div>
         </div>
-    </div>
+    </aside>
 </div>
 {% endblock %}
diff --git a/app/templates/index.html b/app/templates/index.html
index eb103041..abe7b803 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -28,7 +28,7 @@
         </nav>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <!-- <div class="card">
             <div class="card-body">
                 <form method="get">
@@ -69,6 +69,6 @@
         </div>
 
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 {% endblock %}
diff --git a/app/templates/keyboard_shortcuts.html b/app/templates/keyboard_shortcuts.html
index 90524387..3736e670 100644
--- a/app/templates/keyboard_shortcuts.html
+++ b/app/templates/keyboard_shortcuts.html
@@ -53,7 +53,7 @@
 
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card mt-3">
             <div class="card-header">
                  <h2>{{ _('About %(site_name)s', site_name=g.site.name) }}</h2>
@@ -63,6 +63,6 @@
                 <p>{{ g.site.sidebar|safe }}</p>
             </div>
         </div>
-    </div>
+    </aside>
 </div>
 {% endblock %}
diff --git a/app/templates/post/add_reply.html b/app/templates/post/add_reply.html
index 8a5e0420..e0d04f83 100644
--- a/app/templates/post/add_reply.html
+++ b/app/templates/post/add_reply.html
@@ -31,7 +31,7 @@
             {% endif %}
         </div>
     </div>
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card">
             <div class="card-body">
                 <div class="row">
@@ -80,7 +80,7 @@
         </div>
         {% endif %}
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 
 {% endblock %}
diff --git a/app/templates/post/continue_discussion.html b/app/templates/post/continue_discussion.html
index cfadac77..d0c42ea6 100644
--- a/app/templates/post/continue_discussion.html
+++ b/app/templates/post/continue_discussion.html
@@ -83,7 +83,7 @@
         </div>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card">
             <div class="card-body">
                 <div class="row">
@@ -132,7 +132,7 @@
         </div>
         {% endif %}
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 
 {% endblock %}
diff --git a/app/templates/post/post.html b/app/templates/post/post.html
index c0eb71e0..46a21918 100644
--- a/app/templates/post/post.html
+++ b/app/templates/post/post.html
@@ -150,7 +150,7 @@
         {% endif %}
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card">
             <div class="card-body">
                 <div class="row">
@@ -199,7 +199,7 @@
         </div>
         {% endif %}
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 <script nonce="{{ session['nonce'] }}">
     window.addEventListener("load", function () {
diff --git a/app/templates/post/post_edit.html b/app/templates/post/post_edit.html
index 64978ca1..2f7d7e89 100644
--- a/app/templates/post/post_edit.html
+++ b/app/templates/post/post_edit.html
@@ -133,7 +133,7 @@
         </form>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card mt-3">
             <div class="card-header">
                  <h2>{{ post.community.title }}</h2>
@@ -143,7 +143,7 @@
                 <p>{{ post.community.rules|safe }}</p>
             </div>
         </div>
-    </div>
+    </aside>
     {% include "_inoculation_links.html" %}
 </div>
 {% endblock %}
\ No newline at end of file
diff --git a/app/templates/post/post_reply_edit.html b/app/templates/post/post_reply_edit.html
index b1f730f5..26fcdea6 100644
--- a/app/templates/post/post_reply_edit.html
+++ b/app/templates/post/post_reply_edit.html
@@ -31,7 +31,7 @@
             {% endif %}
         </div>
     </div>
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         <div class="card">
             <div class="card-body">
                 <div class="row">
@@ -80,7 +80,7 @@
         </div>
         {% endif %}
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 
 {% endblock %}
diff --git a/app/templates/privacy.html b/app/templates/privacy.html
index 0b03aa89..1f0f5ea2 100644
--- a/app/templates/privacy.html
+++ b/app/templates/privacy.html
@@ -71,8 +71,8 @@
 
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
 
-    </div>
+    </aside>
 </div>
 {% endblock %}
diff --git a/app/templates/topic/show_topic.html b/app/templates/topic/show_topic.html
index 510d77dc..9e762aa6 100644
--- a/app/templates/topic/show_topic.html
+++ b/app/templates/topic/show_topic.html
@@ -47,7 +47,7 @@
         </nav>
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         {% if topic_communities %}
         <div class="card mt-3">
             <div class="card-header">
@@ -68,7 +68,7 @@
         </div>
         {% endif %}
         {% include "_inoculation_links.html" %}
-    </div>
+    </aside>
 </div>
 <div class="row">
 
diff --git a/app/templates/user/notifications.html b/app/templates/user/notifications.html
index effbb88b..66d2bfa8 100644
--- a/app/templates/user/notifications.html
+++ b/app/templates/user/notifications.html
@@ -38,7 +38,7 @@
         {% endif %}
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
 
         <div class="card mt-3">
             <div class="card-header">
@@ -100,6 +100,6 @@
                 </div>
             </div>
         {% endif %}
-    </div>
+    </aside>
 </div>
 {% endblock %}
diff --git a/app/templates/user/people.html b/app/templates/user/people.html
index ef1ce2f2..3a288038 100644
--- a/app/templates/user/people.html
+++ b/app/templates/user/people.html
@@ -29,7 +29,7 @@
         {% endif %}
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
 
         <div class="card mt-3">
             <div class="card-header">
@@ -39,6 +39,6 @@
 
             </div>
         </div>
-    </div>
+    </aside>
 </div>
 {% endblock %}
diff --git a/app/templates/user/show_profile.html b/app/templates/user/show_profile.html
index 12f3dc92..182bb0c9 100644
--- a/app/templates/user/show_profile.html
+++ b/app/templates/user/show_profile.html
@@ -100,7 +100,7 @@
         {% endif %}
     </div>
 
-    <div class="col-12 col-md-4 side_pane" role="complementary">
+    <aside class="col-12 col-md-4 side_pane" role="complementary">
         {% if current_user.is_authenticated and current_user.id == user.id %}
             <div class="card mt-3">
                 <div class="card-header">
@@ -193,6 +193,6 @@
                 </div>
             </div>
         {% endif %}
-    </div>
+    </aside>
 </div>
 {% endblock %}