diff --git a/routes/css.cpp b/routes/css.cpp
index 35e7a90..b9038c5 100644
--- a/routes/css.cpp
+++ b/routes/css.cpp
@@ -139,6 +139,11 @@ svg {
 .post-attachments audio {
     height: 40px;
 }
+/* https://chaosfem.tw/@betsystreeter@mastodon.art/111456606953658581 */
+.post-attachments .unknown_media {
+    max-width: 320px;
+    max-height: 180px;
+}
 
 /* POLL */
 .poll-option {
diff --git a/servehelper.cpp b/servehelper.cpp
index 79fa956..3438686 100644
--- a/servehelper.cpp
+++ b/servehelper.cpp
@@ -544,9 +544,9 @@ static inline Element serialize_media(const Media& media) {
         } else if (media.type == "unknown") {
             if (media.remote_url) {
                 // https://botsin.space/@lina@vt.social/111053598696451525
-                return Element("a", {{"href", *media.remote_url}}, {"Media is not available from this instance, view externally"});
+                return Element("a", {{"class", "unknown_media"}, {"href", *media.remote_url}}, {"Media is not available from this instance, view externally"});
             } else {
-                return Element("p", {"Media is not available from this instance"});
+                return Element("p", {{"class", "unknown_media"}}, {"Media is not available from this instance"});
             }
         } else {
             return Element("p", {"Unsupported media type: ", media.type});