Replacing this page

[info at itnserver.com]

When I run the ocserv I get this page. Is it possible to change its 
design? If so where can I find the related files.


https://ip SERVER:443


This XML file does not appear to have any style information associated 
with it. The document tree is shown below.
<config-auth client="vpn" type="auth-request">
<version who="sg">0.1(1)</version>
<auth id="main">
<message>Please enter your username</message>
<form method="post" action="/auth">
<input type="text" name="username" label="Username:"/>
</form>
</auth>
</config-auth>