Add a post_type class to the admin body element. Helpful when styling custom post types.

filter_admin_body_class.php

/**
 * Filter Admin body class
 * 
 * Add a post_type class to the admin body element. Helpful when styling custom post types.
 **/
add_filter( 'admin_body_class', 'vc_admin_body_class' );
function vc_admin_body_class( $admin_body_class ) {
	global $post;
	
	if ( $_GET['post_type'] )
		$post_type = $_GET['post_type'];
	elseif ( $post->post_type )
		$post_type = $post->post_type;
	
	if ( $post_type )
		$admin_body_class = "$admin_body_class post_type-$post_type";
	
	return $admin_body_class;
	
} // end function vc_admin_body_class