diff --git a/templates/verify.html.j2 b/templates/verify.html.j2
index ab1bd0f..99c1c1f 100644
--- a/templates/verify.html.j2
+++ b/templates/verify.html.j2
@@ -3,7 +3,7 @@
 <h1>Enter 6-digit code</h1>
 <form method="POST">
     <label for="code">Code:</label>
-    <input type="text" name="code" required>
+    <input type="text" name="code" id="code" required pattern="\d{6}" minlength="6" maxlength="6" inputmode="numeric">
     <button type="submit">Verify</button>
 </form>
 {% endblock %}