What does this do?

• Adds URL redirection to homepage on images
• Adjusts login header image.
• Styles the login page for Dark Theme
• 37 lines of code ?

On every WordPress site, I download Code Snippets plugin and add this code snippet:

function custom_login_logo_url() {
	return home_url();
}
add_filter('login_headerurl', 'custom_login_logo_url');

function custom_login_logo() {
	echo '
       <style type="text/css">
           #login h1 a {
				background-image: url("https://maggew.com/wp-content/uploads/2023/11/logo-von-sticky-menu.png");
				background-size: contain;
				background-position: center;
			}
		   body {
				background: #090909;
				color: #B0AFAC;
				font-size: 13px;
			}
			.login form {
				background: #1F2020;
				border: none;
				box-shadow: none;
			}
			.login form .input, .login form input[type=checkbox], .login input[type=text] {
				background: #2B2B2B;
				color: #FFF;
				text-align: center;
				font-size: 16px;
			}
			.login .message, .login .notice, .login .success {
				border-left: 4px solid #2271B1;
				background-color: #2B2B2B;
				box-shadow:none;
			}
       </style>';
}
add_action('login_head', 'custom_login_logo');

In 2024, WordPress still lacks essential quality-of-life features like a dark admin theme and a matching login page, forcing users to rely on third-party plugins while the company focuses on promoting its WordPress.com platform.