diff --git a/src/css/custom.scss b/src/css/custom.scss
index 2457c3b..02c04ba 100644
--- a/src/css/custom.scss
+++ b/src/css/custom.scss
@@ -79,3 +79,8 @@ text {
     }
   }
 }
+
+.mastodon-embed {
+  max-width: 100%;
+  border: 0;
+}