diff --git a/src/uncloseai-modal-builtin.css b/src/uncloseai-modal-builtin.css
index 6b0cbb1..6226ab0 100644
--- a/src/uncloseai-modal-builtin.css
+++ b/src/uncloseai-modal-builtin.css
@@ -1122,11 +1122,11 @@ dialog#uncloseai-embedded-modal[data-theme="dark"] .uncloseai-chat-box {
 /* Code blocks within AI messages - allow horizontal scroll, preserve all whitespace */
 .ai-message pre {
   overflow-x: auto;
-  max-width: 72vw;
+  max-width: min(72vw, 900px);
 }
 
 .ai-message code {
-  max-width: 72vw;
+  max-width: min(72vw, 900px);
 }
 
 /* Mobile: use viewport units since modal is fullscreen */
diff --git a/src/uncloseai-modal-pico.css b/src/uncloseai-modal-pico.css
index 0291937..52e68ae 100644
--- a/src/uncloseai-modal-pico.css
+++ b/src/uncloseai-modal-pico.css
@@ -1195,11 +1195,11 @@ dialog#uncloseai-embedded-modal[data-theme="dark"] .uncloseai-chat-box {
 /* Code blocks within AI messages - allow horizontal scroll, preserve all whitespace */
 .ai-message pre {
   overflow-x: auto;
-  max-width: 72vw;
+  max-width: min(72vw, 900px);
 }
 
 .ai-message code {
-  max-width: 72vw;
+  max-width: min(72vw, 900px);
 }
 
 /* Mobile: use viewport units since modal is fullscreen */