Details
Althought it's not possible to import a custom logo for the captive portal block page, the browser can be redirected to a site with a file containing the logo. The browser must be able to reach the file in order for this procedure to work.
An example of a custom block page with a logo is located at: www.mysite.com/logo.jpg
<html>
<head>
<title>Web Page Blocked</title>
<img src="www.mysite.com/logo.jpg" data alt="Logo">
<style>
#content{border:3px solid#aaa;background-color:#fff;margin:40;padding:40;font-family:Tahoma,Helvetica,Arial,sans-serif;font-size:12px;}
h1{font-size:20px;font-weight:bold;color:#196390;}
b{font-weight:bold;color:#196390;}
</style>
</head>
<body bgcolor="#e7e8e9">
<div id="content">
<h1>Web Page Blocked</h1>
<p>Access to the web page you were trying to visit has been blocked in accordance with company policy. Please contact your system administrator if you believe this is in error.</p>
<p><b>User:</b> <user/> </p>
<p><b>URL:</b> <url/> </p>
<p><b>Category:</b> <category/> </p>
</div>
</body>
</html>
owner: panagent