diff --git a/server/src/lib.rs b/server/src/lib.rs
index c67d982..91d2259 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -83,8 +83,9 @@ pub fn sanitize_html(html: &str) -> Result<String, SanitizeError> {
         }
     };
     // Default's don't allow style, but we want to preserve that.
-    let attributes =
-        hashset!["align", "bgcolor", "color", "height", "lang", "title", "width", "style",];
+    let attributes = hashset![
+        "align", "bgcolor", "class", "color", "height", "lang", "title", "width", "style",
+    ];
 
     let tags = hashset![
         "a",