diff --git a/public/src/uncloseai-modal-builtin.css b/public/src/uncloseai-modal-builtin.css
index 8e7ea9d..f704a95 100644
--- a/public/src/uncloseai-modal-builtin.css
+++ b/public/src/uncloseai-modal-builtin.css
@@ -1143,6 +1143,10 @@ dialog#uncloseai-embedded-modal[data-theme="dark"] .uncloseai-chat-box {
   overflow-x: auto;
   overflow-y: visible;
   max-width: min(72vw, 900px);
+  background: #2b2b2b;
+  color: #f8f8f2;
+  border-radius: 8px;
+  padding: 16px;
 }
 
 .ai-message code {
diff --git a/public/src/uncloseai-modal-pico.css b/public/src/uncloseai-modal-pico.css
index 870d8ff..035a2cb 100644
--- a/public/src/uncloseai-modal-pico.css
+++ b/public/src/uncloseai-modal-pico.css
@@ -1221,6 +1221,10 @@ dialog#uncloseai-embedded-modal[data-theme="dark"] .uncloseai-chat-box {
   overflow-x: auto;
   overflow-y: visible;
   max-width: min(72vw, 900px);
+  background: #2b2b2b;
+  color: #f8f8f2;
+  border-radius: 8px;
+  padding: 16px;
 }
 
 .ai-message code {