WordPress Maintenance Mode Without a Plugin Part 2
A few days ago I wrote a post about WordPress Maintenance Mode Without a Plugin. A common question that I got afterwards was whether or not the maintenance page could be styled. The answer, is yes it can be.
After wp-settings.php determines whether or not to put the blog into maintenance mode it checks to see if there is a file titled maintenance.php located in WP_CONTENT_DIR which is by default wp-content/.
Simply create a file at wp-content/maintenance.php containing the code you want to display the for the maintenance page. Below is a sample of code based off of the default maintenance page.
<?php
$protocol = $_SERVER["SERVER_PROTOCOL"];
if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
$protocol = 'HTTP/1.0';
header( "$protocol 503 Service Unavailable", true, 503 );
header( 'Content-Type: text/html; charset=utf-8' );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<h1>Briefly unavailable for scheduled maintenance. Check back in a minute.</h1>
</body>
</html>
<?php die(); ?>
Modify as needed, add some css, some images and there you go.

Excellent post. I am impressed with your writing style. The way you have explained is really good and easy to understand for me. This post will definitely help the newbies like me. I keep seeing articles like these. Thanks for sharing. Keep blogging.
I ABSOLUTELY LOVE YOU!!! This is amazing. I have been looking for something like this for the longest time. I tried it and it works like a charm. Simply Brilliant AMigo!
Great tip. There’s a Post (http://webanthology.net/do-it-yourself-12-wordpress-solutions-without-using-plugins/2009/12/14/) about without-plugin solutions. I think your solution must be there surely.