diff --git a/static/c4.css b/static/c4.css
index 687ad87..8b46887 100644
--- a/static/c4.css
+++ b/static/c4.css
@@ -7,6 +7,11 @@ h1, h1 a  {
     color: #dfaa37; /* C4 Yellow */
 }
 
+#search.failed {
+    color: #200;
+    background-color: #ec6d5f;
+}
+
 #itemcount {
     display: inline-block;
     margin-right: 1ch;
diff --git a/static/index.js b/static/index.js
index a79b6dd..3be7022 100644
--- a/static/index.js
+++ b/static/index.js
@@ -95,6 +95,14 @@ function search(e) {
       elem.classList.add('filtered');
     }
   }
+
+  // Indicate failed search.
+  if (count) {
+    e.target.classList.remove('failed');
+  } else {
+    e.target.classList.add('failed');
+  }
+
   updateCounter(count);
 }