Resolves #325

Author: haydenbleasel

.changeset/fine-drinks-juggle.md

@@ -0,0 +1,5 @@
+---
+"streamdown": patch
+---
+
+Fix: className styles not applied during active streaming

packages/streamdown/index.tsx

@@ -371,6 +371,7 @@ export const Streamdown = memo(
     prevProps.shikiTheme === nextProps.shikiTheme &&
     prevProps.isAnimating === nextProps.isAnimating &&
     prevProps.mode === nextProps.mode &&
-    prevProps.plugins === nextProps.plugins
+    prevProps.plugins === nextProps.plugins &&
+    prevProps.className === nextProps.className
 );
 Streamdown.displayName = "Streamdown";