diff --git a/web/src/app/chat/components/research-block.tsx b/web/src/app/chat/components/research-block.tsx
index d02d59d..52779fd 100644
--- a/web/src/app/chat/components/research-block.tsx
+++ b/web/src/app/chat/components/research-block.tsx
@@ -97,6 +97,7 @@ export function ResearchBlock({
                   className="text-gray-400"
                   size="icon"
                   variant="ghost"
+                  disabled={isReplay}
                   onClick={handleEdit}
                 >
                   {editing ? <Undo2 /> : <Pencil />}
diff --git a/web/src/components/editor/extensions.tsx b/web/src/components/editor/extensions.tsx
index da060d7..2cd4c9f 100644
--- a/web/src/components/editor/extensions.tsx
+++ b/web/src/components/editor/extensions.tsx
@@ -78,16 +78,12 @@ const taskItem = TaskItem.configure({
 });
 
 const horizontalRule = HorizontalRule.configure({
-  HTMLAttributes: {
-    class: cx("mt-4 mb-6 border-t border-muted-foreground"),
-  },
+  HTMLAttributes: {},
 });
 
 const starterKit = StarterKit.configure({
   bulletList: {
-    HTMLAttributes: {
-      class: cx("list-disc list-outside leading-3 -mt-2"),
-    },
+    HTMLAttributes: {},
   },
   orderedList: {
     HTMLAttributes: {
@@ -95,9 +91,7 @@ const starterKit = StarterKit.configure({
     },
   },
   listItem: {
-    HTMLAttributes: {
-      class: cx("leading-normal -mb-2"),
-    },
+    HTMLAttributes: {},
   },
   blockquote: {
     HTMLAttributes: {
@@ -107,7 +101,6 @@ const starterKit = StarterKit.configure({
   codeBlock: false,
   code: {
     HTMLAttributes: {
-      class: cx("rounded-md bg-muted  px-1.5 py-1 font-mono font-medium"),
       spellcheck: "false",
     },
   },