diff --git a/claude_sonnet-3-7-bedrock.py b/claude_sonnet-3-7-bedrock.py
index ca37149..fbe4304 100644
--- a/claude_sonnet-3-7-bedrock.py
+++ b/claude_sonnet-3-7-bedrock.py
@@ -186,7 +186,7 @@ class Pipeline:
                 if "reasoningContent" in delta and "text" in delta["reasoningContent"]:
                   if not thinking_start:
                     thinking_start = True
-                    yield "\n<Thinking>\n\n"
+                    yield '<details type="reasoning" done="true">\n<summary>Thinking…</summary>\n'
                   print(f"Reasoning content: {delta['reasoningContent']}") 
                   yield delta["reasoningContent"]["text"]