diff --git a/public/scripts/extensions/tts/style.css b/public/scripts/extensions/tts/style.css
index 960467c06..4d379a798 100644
--- a/public/scripts/extensions/tts/style.css
+++ b/public/scripts/extensions/tts/style.css
@@ -93,7 +93,7 @@
 .at-settings-separator {
     margin-top: 10px;
     margin-bottom: 10px;
-    padding: 18x;
+    padding: 18px;
     font-weight: bold;
     border-top: 1px solid #e1e1e1; /* Grey line */
     border-bottom: 1px solid #e1e1e1; /* Grey line */