diff --git a/src/uncloseai-modal-builtin.css b/src/uncloseai-modal-builtin.css
index abe4990..3d87d89 100644
--- a/src/uncloseai-modal-builtin.css
+++ b/src/uncloseai-modal-builtin.css
@@ -811,7 +811,7 @@ dialog#tts-modal {
   cursor: pointer;
   opacity: 0.8;
   transition: opacity 0.2s;
-  z-index: 10;
+  z-index: 5;
 }
 
 .uncloseai-code-copy-btn:hover {
diff --git a/src/uncloseai-modal-pico.css b/src/uncloseai-modal-pico.css
index fad5003..e207284 100644
--- a/src/uncloseai-modal-pico.css
+++ b/src/uncloseai-modal-pico.css
@@ -867,7 +867,7 @@ dialog#tts-modal::backdrop {
   cursor: pointer;
   opacity: 0.8;
   transition: opacity 0.2s;
-  z-index: 10;
+  z-index: 5;
 }
 
 .uncloseai-code-copy-btn:hover {