diff --git a/src/uncloseai-modal-builtin.css b/src/uncloseai-modal-builtin.css
index 14759e4..cbdf6c2 100644
--- a/src/uncloseai-modal-builtin.css
+++ b/src/uncloseai-modal-builtin.css
@@ -91,7 +91,7 @@ dialog#uncloseai-embedded-modal[data-theme="light"] {
   overflow-y: auto;
   padding: 0px;
   -webkit-overflow-scrolling: touch;
-  background: var(--uncloseai-content-background, #f8f9fa);
+  background: transparent;
 }
 
 /* Settings panel */
@@ -886,7 +886,7 @@ dialog#tts-modal {
   overflow-y: auto;
   padding: 0px;
   -webkit-overflow-scrolling: touch;
-  background: var(--uncloseai-content-background, #f8f9fa);
+  background: transparent;
 }
 
 .uncloseai-chat-box {