diff --git a/app/source.py b/app/source.py
index 4324c2b..b555ceb 100644
--- a/app/source.py
+++ b/app/source.py
@@ -61,7 +61,7 @@ async def _mentionify(
         mentioned_actors.append(actor)
         tags.append(dict(type="Mention", href=actor.ap_id, name=mention))
 
-        link = f'<span class="h-card"><a href="{actor.url}" class="u-url mention">@{username}</a></span>'  # noqa: E501
+        link = f'<span class="h-card"><a href="{actor.url}" class="u-url mention">{actor.handle}</a></span>'  # noqa: E501
         content = content.replace(mention, link)
     return content, tags, mentioned_actors
 
diff --git a/app/templates.py b/app/templates.py
index de3c5d1..c1f4ec1 100644
--- a/app/templates.py
+++ b/app/templates.py
@@ -177,6 +177,11 @@ ALLOWED_TAGS = [
 ]
 
 ALLOWED_CSS_CLASSES = [
+    # microformats
+    "h-card",
+    "u-url",
+    "mention",
+    # code highlighting
     "highlight",
     "codehilite",
     "hll",