// Muda o logotipo na tela de login do painel administrativo

function my_custom_login_logo() {
  echo '
  <style type="text/css">
      .login h1 a {
    background-image:url('.get_bloginfo('template_directory').'/login.png) !important;
    background-size: 300px 150px;
    height: 150px;}
  </style>';
}

add_action('login_head', 'my_custom_login_logo');