customlogin.php

<?php
function my_custom_login_logo()
{
    echo '<style type="text/css"> 
	h1 a { display:none !important; } 
	body { background:#674172 !important;} 
	.login #backtoblog a, .login #nav a {color:white !important;}
	wp-core-ui .button-primary {  
	background: #674172 !important; 
	color: #FFF; 
	text-decoration: none; 
	border: none !important;
	border-radius:0px !important;}
	</style>';
}
add_action('login_head',  'my_custom_login_logo');
?>