diff --git a/.changeset/real-experts-leave.md b/.changeset/real-experts-leave.md
new file mode 100644
index 0000000..7ae3f92
--- /dev/null
+++ b/.changeset/real-experts-leave.md
@@ -0,0 +1,5 @@
+---
+"ai-elements": patch
+---
+
+Fix chain-of-thoughts dropdown arrow alignment by replacing `max-w-prose` with `w-full` for proper responsive layout.
diff --git a/packages/elements/src/chain-of-thought.tsx b/packages/elements/src/chain-of-thought.tsx
index 0b137b6..cc44c0a 100644
--- a/packages/elements/src/chain-of-thought.tsx
+++ b/packages/elements/src/chain-of-thought.tsx
@@ -64,10 +64,7 @@ export const ChainOfThought = memo(
 
     return (
       <ChainOfThoughtContext.Provider value={chainOfThoughtContext}>
-        <div
-          className={cn("not-prose max-w-prose space-y-4", className)}
-          {...props}
-        >
+        <div className={cn("not-prose w-full space-y-4", className)} {...props}>
           {children}
         </div>
       </ChainOfThoughtContext.Provider>