Add or modify styles and upload path as necessary to accommodate logo.
function custom_login_logo() {
echo '<style type="text/css">
.login h1 a { background-image:url(/wp-content/uploads/2020/09/site-logo.png) !important; width:300px!important; background
-size:300px!important; height:80px!important; margin: 0 auto 10px!important; }
.login h1 { line-height:1!important; margin:0!important; height:80px!important; }
</style>';
}
add_action('login_head', 'custom_login_logo');
add_filter( 'login_headerurl', 'custom_loginlogo_url' );
function custom_loginlogo_url($url) {
return 'https://sitename.com';
}
