There is a Custom Admin Branding plugin for that, but why bother when you can insert a few lines into your theme’s functions.php file?

However, if you like to change up your site’s theme sometimes, you probably want to change the log in page too. A lot of people have been really hooked into branding their WordPress log in page, especially since guest blogging has become popular.

Here is the code I put together for WPAddict. This is all merely adding CSS and an action to your theme’s functions.php file.

Adding the action for your custom login:


add_action('login_head', 'my_custom_login_logo');


Replace the WordPress logo:


function my_custom_login_logo() {
echo '<style type="text/css">
h1 a { background-image:url('.get_bloginfo('template_directory').'/images/custom-login-logo.png) !important;height:160px;width:322px;margin-bottom:5px;margin-top:-70px; }


Remove the border at the top of the login page:


body { border-top-style:none; }


Adding your own background to the login page:


html {background:#fff url('.get_bloginfo('template_directory').'/images/bgr_html2.png) repeat-x;}


Removing the Back to blog link:


#backtoblog { display:none; }
</style>';
}


Full code:


function my_custom_login_logo() {
echo '<style type="text/css">
h1 a { background-image:url('.get_bloginfo('template_directory').'/images/custom-login-logo.png) !important;height:160px;width:322px;margin-bottom:5px;margin-top:-70px; }
body { border-top-style:none; }
html {background:#fff url('.get_bloginfo('template_directory').'/images/bgr_html2.png) repeat-x;}
#backtoblog { display:none; }
</style>';
}

add_action('login_head', 'my_custom_login_logo');


You can customize more of the page too, so just view the source of your login page and you can put other CSS attributes into the code above.

Related posts:

1. Brand Your WordPress Login Without A Plugin – Part 2
2. Making A Two-Tiered Navigation in WordPress
3. Custom Thesis Theme #1: Blue Simplicity
4. How to Change The Default Avatar
5. Creating A Simple Author Profile Page In WordPress