diff --git a/core/bubbles/textinput_bubble.ts b/core/bubbles/textinput_bubble.ts
index a3c572faf..2784b5cb6 100644
--- a/core/bubbles/textinput_bubble.ts
+++ b/core/bubbles/textinput_bubble.ts
@@ -307,8 +307,8 @@ export class TextInputBubble extends Bubble {
 }
 
 Css.register(`
-.blocklyCommentTextarea {
-  background-color: #fef49c;
+.blocklyTextInputBubble .blocklyTextarea {
+  background-color: var(--commentFillColour);
   border: 0;
   display: block;
   margin: 0;