Style the WordPress login page

functions.php

<?php

// Add styles to the login page
function login_css() { ?>
<style type="text/css">
	/* Change the WP logo to your own */
	#login h1 a, .login h1 a {
		background-image: url('<?php echo get_stylesheet_directory_uri(); ?>/path/to/logo.png');
		height: 150px;
		width: 150px;
		background-size: 150px 150px;
		background-repeat: no-repeat;
	}
</style>
<?php }

// Change the URL of the link wrapping the logo
add_action( 'login_enqueue_scripts', 'login_css' );
function my_login_logo_url() {
    return home_url();
}
add_filter( 'login_headerurl', 'my_login_logo_url' );

// Change the title of the link wrapping the logo
function my_login_logo_url_title() {
    return 'Integrous Fences and Decks';
}
add_filter( 'login_headertitle', 'my_login_logo_url_title' );