Use bootstrap cards for feedback pages

Change-Id: I811bf2f3ce2992b7110d6742069eb07f38bd5b37
diff --git a/templates/token_expired.htm b/templates/token_expired.htm
index 5c6321c..8e9379e 100644
--- a/templates/token_expired.htm
+++ b/templates/token_expired.htm
@@ -1 +1,3 @@
-<h2>Your confirmation token expired!</h2>
+<div class="alert alert-warning" role="alert">
+    Your confirmation token expired!
+</div>