diff --git a/lib/main.html b/lib/main.html
index 8512056f..4d34fee3 100644
--- a/lib/main.html
+++ b/lib/main.html
@@ -90,5 +90,10 @@
     scriptEl.setAttribute('src', scriptUrl)
     document.body.appendChild(scriptEl)
   </script>
+  <style>
+    .ace_search {
+      background-color: #d9d9d9;
+    }
+  </style>
 </body>
 </html>