body.login div#login h1 a {
    background-image: url('https://www.alpharentacar.ar/wp-content/themes/alpha/images/alpha-login.png');
    background-size: 100%;
    width: 100px;
    margin: 0 auto 0;
    height: 100px;
}

body.login div#login form#loginform p.submit input#wp-submit {
    background: #9ac11d;
    border-color: #63ffb1;
}