diff --git a/theme/basic.css b/theme/basic.css
index df89d5e..9b28c51 100644
--- a/theme/basic.css
+++ b/theme/basic.css
@@ -48,6 +48,10 @@ input, select {
 	margin: 0.2em;
 	max-width: 30em;
 }
+input {
+  background-color: #ccc4;
+  color: inherit;
+}
 .notification, .error {
   padding: 0 1em;
   border-radius: 8px;
@@ -99,7 +103,8 @@ nav li, .category li {
   max-width: 100%;
 }
 input:invalid {
-  border-color: red;
+  background-color: #800;
+  color: white;
 }
 .answer_ok {
   cursor: help;
diff --git a/theme/puzzle.mjs b/theme/puzzle.mjs
index 7d845ad..07509cf 100644
--- a/theme/puzzle.mjs
+++ b/theme/puzzle.mjs
@@ -150,7 +150,9 @@ async function loadPuzzle(category, points) {
     document.querySelector("title").textContent = title
     document.querySelector("#title").textContent = title
     document.querySelector("#authors").textContent = puzzle.Authors.join(", ")
-    document.querySelector("#answer").pattern = window.puzzle.AnswerPattern
+    if (puzzle.AnswerPattern) {
+        document.querySelector("#answer").pattern = puzzle.AnswerPattern
+    }
     puzzleElement().innerHTML = puzzle.Body
 
     console.info("Adding attached scripts...")