How do I embed my own login logo?

With the following code in functions.php, you can create your own logo above the login box.

function geek_login_logo() {
?>
 <style type="text/css">
 #login h1 a, .login h1 a {
 background-image: url(logo.png);
 margin-bottom: 0;
 background-size: 200px;
 height: 200px;
 width: 200px;
 margin-left: auto;
 margin-right: auto;
 border-radius: 50%;
 }
 body.login {background-color: #fff;} .login #backtoblog a, .login #nav a {color: #ff0000 !important}
 </style>
<?php }
add_action( 'login_enqueue_scripts', 'geek_login_logo' );