center "invalid username and/or password" text

templates/login.html

@@ -1,4 +1,4 @@
-{error?<h2>{error}</h2>}
+{error?<h2 style="text-align:center">{error}</h2>}
 <form action="" method="post">
 {redirect?<input type="hidden" name="redirect" value="{redirect}" />}
 <table style="margin-top:25px;">