Como mudar a tela de login do Wordpress

wordpress_mudar_tela_de_login.php

<?php
//Arquivo functions.php

function muda_cor_botao(){?>
<style type="text/css">
/*PARA MUDAR O FUNDO DA PÁGINA*/
body{
    background:#black !important;
}
	
/*PARA MUDAR O LOGO E O TAMANHO DO LOGO*/
#login h1 a, .login h1 a {
   background-image: url("/wp-content/uploads/2020/10/logo-bmb.png");
   height: 200px;
   width: 265px;
   background-color: white;
   background-size: 185px 199px;
   background-repeat: no-repeat;
}
	
 /*PARA MUDAR A COR E TAMANHO DO BOTÃO*/
.login #wp-submit {
    background-color: #yellow  !important;
    border-color: white !important;
    box-shadow: inset 0 2px 0 white !important;
    vertical-align: top;
    width: 100%;
    padding: 12px;
    margin-top: 16px;
 }        
</style>
  
<?php }

add_action('login_enqueue_scripts', "muda_cor_botao");