Added to functions.php to replace WordPress Logo with other branding for sites.

wp-custom-login.php

<?php

/**
 * Customized Login Actions
 * 
 */
function loginlogo() { // TODO use brand colors if possible

    echo "<style type=\"text/css\">
    .login h1 a {
      background-image: url('" . get_template_directory_uri() . "/dist/images/logo-avatar.png') !important;
      width:150px;height:150px;background-size:150px 150px;background-position: center center;
    }
    .login #nav {
      text-align: center;
      
    }
    #backtoblog {
      text-align: center;
      color: #008EC2 !important;
    }
    #backtoblog a { 
      color: #008EC2 !important;
      font-weight: 700;
      font-size: 1rem;
    }
  </style>";

}

add_action('login_head', 'loginlogo');

function greg_loginURL() {
  return 'https://gregmiller.io';
}
add_filter('login_headerurl', 'greg_loginURL');

function greg_loginURLtext() {
  return 'Greg™ | Mobile-first Branding, Development, Maintenance, & Hosting';
}
add_filter('login_headertitle', 'greg_loginURLtext');

function greg_loginfooter() { ?>
  <p style="text-align: center; margin-top: 1em; color: #b4b4b4;">
    If you would like a cool site like this, <a style="color: rgba(238,64,11,0.52); text-decoration: none;" href="https://gregmiller.io/contact/">ask for Greg</a>.
  </p>

<?php }
add_action('login_footer','greg_loginfooter');

?>